Courses

Explore the world of pottery tool craftsmanship in this 15-minute video review. Delve into the intricacies of a new tungsten carbide trimmer, gifted by Rahmi Imrak of RD Pottery & Tools. Gain insights into the advantages and limitations of tungsten carbide in various pottery scenarios. Examine the trimmer's design, including its handle and blade shape. Watch practical demonstrations as two bowls are trimmed, and learn why these tools may not be ideal for surface finishing. Discover the presenter's cleaning techniques for trimmers and engage in a discussion about tool manufacturing, market dynamics, and the concept of design replication in the pottery tool industry. Perfect for pottery enthusiasts looking to expand their knowledge of specialized tools and techniques.

Learn how to refill the trimmer line on your weed eater in this 16-minute video tutorial. Gain a comprehensive understanding of the basic procedure for adding more line to various trimmer brands, including Husqvarna, Stihl, and Echo. Explore the inner workings of trimmer spools and discover tips for efficiently reloading your trimmer line. Follow along as the instructor demonstrates the step-by-step process, providing valuable insights to help you maintain your lawn care equipment with confidence.

Learn about parse trees, left-most and right-most derivation trees, and derivation trees in compiler design through this informative video. Explore the fundamental concepts of syntax analysis and parsing techniques used in compilers. Gain insights into how parse trees represent the structure of programming language statements and how derivation trees illustrate the steps in generating sentences from a grammar. Understand the differences between left-most and right-most derivations and their applications in compiler construction.

Learn to repair a Homelite trimmer through this 14-minute hands-on tutorial that transforms a customer's discarded equipment into working condition. Follow along as an experienced small engine repair specialist demonstrates the step-by-step process of diagnosing and fixing common issues with this popular trimmer model. Discover practical troubleshooting techniques, identify the tools needed for the repair, and understand the specific problems that typically plague Homelite trimmers. Master the repair process that can save time, money, and frustration while keeping your equipment running smoothly. Gain insights from a professional who has serviced over 2,000 pieces of small engine equipment annually and specializes in various brands including Briggs and Stratton, Kohler, Echo, Shindaiwa, Stihl, Husqvarna, and Honda. Access recommended tools and products through provided affiliate links, including articulating boroscopes, compression testers, spark testers, fuel additives, and other essential repair equipment.

This class will show you how, what and when to apply a specific pruning system. This class will cover the natural pruning system, including structural pruning of young trees, as well as mature tree pruning techniques (crown cleaning, crown thinning, crown raising, crown reduction). More formal systems including pollarding, espalier, and pleaching are also covered. Pruning cycles and seasonal timing are discussed. Mal-pruning is defined (tree topping, lion’s tailing, over thinning), and rehabilitative pruning techniques are explained.Learn the right way to prune roses: hybrid teas, climbers, & landscape roses.

Explore the fascinating science of trees and their profound impact on our planet in this 31-minute conference talk by tree scientist and explorer Harriet Rix. Discover how trees have been shaping Earth's environment for millennia, manipulating fire, water, air, and earth through sophisticated biochemical processes long before modern humans appeared 40,000 years ago. Learn about the remarkable ways trees influence the development of plants beneath them, forge relationships with surrounding flora and fauna, and utilize animals as scouts for exploration and reproduction. Journey from the junipers of Pakistan to the duraka of the Amazon as Rix shares captivating stories of trees she has encountered during her travels, revealing their unique identities and extraordinary capabilities. Drawing from her book "The Genius of Trees," this presentation combines rigorous scientific research with imaginative exploration of how trees have influenced human thought and understanding of the natural world. Gain insights into the complex biochemical mechanisms trees employ to alter planetary air composition, modify water flow patterns, and harness fire as a tool, while understanding how these ancient organisms continue to shape our world today.

Explore the fundamental concepts of binary trees and their various types in this comprehensive data structures tutorial. Learn about the defining characteristics of binary trees, where each node can have at most two children. Dive into five distinct types of binary trees: strictly binary trees, incomplete or almost binary trees, complete or perfect binary trees, left-skewed binary trees, and right-skewed binary trees. Gain a solid understanding of their structures, properties, and applications in computer science and programming.

Monkeys have long fascinated us because of their similarities to the human race. In this free course, Studying mammals: The social climbers, you will find out about some of the characteristics that make them so like us: their physiology, complex social interactions, large brains and intelligence. This is the ninth course in the Studying mammals series.

Learn how to perform deletions in AVL trees through a detailed 27-minute tutorial. Explore the process of deleting existing nodes and rebalancing the tree when the balance factor becomes imbalanced. Follow along with step-by-step diagrams and explanations as the instructor solves a practical example, demonstrating the necessary rotations to maintain the AVL tree's self-balancing property. Gain a deeper understanding of AVL tree operations and their importance in maintaining efficient data structures for search, insertion, and deletion operations.

Explore a physics problem focused on friction and forces acting on a mountain climber in this 10-minute video. Analyze the tension in the rope and the force required for a 52.0-kg climber to remain stationary on a vertical rock face. Calculate the minimum coefficient of friction between the climber's shoes and the cliff. Learn how to apply concepts from introductory algebra-based physics to solve real-world scenarios. This video is part of a comprehensive playlist covering topics from the OpenStax College Physics textbook, providing valuable practice for understanding fundamental physics principles.

This instructional video demonstrates how to save money by repairing outdoor power equipment yourself instead of paying for expensive professional repairs. Learn how to fix a trimmer using an affordable HIPA aftermarket carburetor kit that costs less than $15 and takes under 10 minutes to install. The presenter, Bre, who has professional small engine repair experience and runs her own repair shop, walks through the entire process, showing how accessible DIY repairs can be for equipment like trimmers, mowers, and chainsaws. The video includes links to recommended parts and tools needed for the repair, making it easy for viewers to tackle similar projects and avoid unnecessary expenses on new equipment.

Explore the powerful Syntax Tree toolkit for interacting with Ruby's parse tree in this conference talk from RubyConf Mini 2022. Discover how to analyze, inspect, debug, and format Ruby code using this innovative tool. Learn about its inner workings, practical applications in your own projects, and the exciting future possibilities it unlocks for Ruby development.

This lecture by Stephan Wagner from Graz University of Technology explores the statistical properties of random trees generated from depth-centric tree sources. Presented at the International Conference on Probabilistic, Combinatorial and Asymptotic Methods for the Analysis of Algorithms (AofA 2025) at the Fields Institute on May 8, 2025, the 27-minute talk delves into mathematical models for tree generation with a focus on depth-related parameters. Learn about probabilistic methods for analyzing tree structures, combinatorial approaches to random tree generation, and asymptotic behaviors of tree statistics that are particularly relevant for algorithm analysis and computational applications.

Dive into AVL tree insertion with this comprehensive tutorial that solves two practical problems using diagrams and detailed explanations. Learn how to balance an imbalanced binary search tree using rotations and create an AVL tree from an insert sequence of node values. Explore the four rotation cases: LEFT LEFT, RIGHT RIGHT, LEFT RIGHT, and RIGHT LEFT, with step-by-step demonstrations for each scenario. Gain a solid understanding of AVL tree operations and their implementation in data structures and algorithms.

Learn how to create a stunning origami Christmas tree from a single sheet of paper in this 21-minute tutorial. Follow step-by-step instructions to craft a clean-looking flat origami pine tree with a star on top, designed by Jo Nakashima. Master advanced techniques like open sink folds to achieve a stable, upright tree shape. Choose between a simpler version or challenge yourself with intermediate-level folding for a more refined result. Use a 15cm x 15cm origami paper and progress through various stages including tree levels, side shaping, and adding the finishing star. Perfect for holiday decorations or as a unique handmade gift.

Learn how to create a unique origami Christmas tree from a single sheet of paper in this 16-minute video tutorial. Follow step-by-step instructions to craft a clean-looking flat origami pine tree, featuring advanced techniques like open sink folds. Begin with simple steps and progress to intermediate-level folding, resulting in a standing tree with a well-defined shape. Use a 15cm x 15cm origami paper and explore various difficulty levels, from basic to more complex designs. Discover the art of paper folding while creating a festive decoration perfect for the holiday season.

Learn the fundamental concepts and advanced techniques for reconstructing species trees from gene trees in this comprehensive lecture from the Computational Genomics Summer Institute. Explore the theoretical foundations of phylogenetic reconstruction, beginning with basic principles and progressing to sophisticated algorithms for handling complex evolutionary scenarios. Discover how to address challenges in tree reconstruction including rooted tree consistency enhancement using max cut algorithms, quartet-based phylogenetic reconstruction methods, and compatibility analysis of quartet trees. Examine probabilistic approaches for recovering tree-like evolutionary patterns even in the presence of extensive lateral genetic transfer events. Gain insights into computational methods that bridge the gap between individual gene evolution and species-level phylogenetic relationships, with emphasis on both theoretical underpinnings and practical applications in genomic analysis.

Learn to create a complex origami Christmas tree with a crane on top in this 25-minute tutorial. Follow step-by-step instructions to fold a clean-looking flat pine tree from a single square sheet of paper. Master advanced techniques like open sink folds on the tree's sides. Suitable for intermediate to advanced origami enthusiasts, this project uses a 15cm x 15cm origami paper (demonstrated with 24cm x 24cm for clarity). Progress through various stages including forming tree levels, shaping sides, locking the structure, and crafting the intricate tsuru crane topper. Enhance your paper folding skills while creating a unique holiday decoration.

Learn essential tree data structure concepts and spanning tree algorithms in this comprehensive video lecture. Master fundamental tree terminology including roots, nodes, edges, parent-child relationships, siblings, leaf nodes, internal nodes, degree, height, level, depth, paths and subtrees. Explore minimum cost spanning tree implementations through both Prim's and Kruskal's algorithms with detailed explanations and examples. Gain practical understanding of these important discrete mathematics and algorithm design concepts through clear explanations and step-by-step demonstrations.

Master the fundamentals of drawing syntactic trees in this 51-minute linguistics tutorial that focuses on basic tree structures without delving into X-Bar Theory. Explore essential concepts perfect for introductory linguistics courses and interdisciplinary studies, gaining hands-on practice in constructing and analyzing tree diagrams to represent sentence structure. Develop a strong foundation in syntax analysis through clear explanations and practical examples that demonstrate how to break down sentences into their structural components.