Howard Hughes Medical Institute
Skeletons Reveal Human and Chimpanzee Evolution
Ardipithecus ramidus shares features with both humans and chimpanzees. Learn about where Ardi, humans, and chimps fit in the tree of life by comparing anatomical features including the foot, pelvis, and teeth. After exploring those...
Howard Hughes Medical Institute
Regulation of the Lactase Gene
All human infants are lactose tolerant, yet some adults are lactose intolerant—why is that? Individuals discover the process of gene mutation through a study of the lactase gene (LCT). They understand the geographic connections,...
Howard Hughes Medical Institute
Paleoclimate: A History of Change
Earth's climate changed drastically throughout the history of the planet, so why do scientists blame humans for recent changes? Observe data covering the history of the planet that proves the natural climate change patterns. Then, learn...
Howard Hughes Medical Institute
Geological History of Oxygen
Earth didn't always have oxygen, so what caused the change that allows humans to live here? Learn about the change in O2 levels throughout geological history through an interactive graph. Each section offers greater detail on the changes...
Howard Hughes Medical Institute
Explore Your Inner Animals
Human bodies prove evolution thanks to our genes, bones, and more. Learning about specific body parts and how they evolved from other species helps individuals better understand the transition species that helped us become who we are today.
Howard Hughes Medical Institute
Great Transitions Interactive
How did life evolve from fish to four-limbed animals? Work through an interactive exploring transition animals and comparing their features to understand the transition. Making it even better, the interactive allows scholars to isolate...
Physics Classroom
Parallel Circuits - ∆V = I•R Calculations
Parallel circuits often provide less of a challenge for teens than parallel parking. An installment of a series on parallel electric circuits requires learners to solve increasingly difficult levels of calculations. Each level provides...
Physics Classroom
Series Circuits: ∆V=I•R Calculations
Better than some television series, parallel series circuits provide practice for calculations. Scholars work through a series of problems, each progressively more difficult. They apply knowledge of voltage calculations, resistors, and...
Physics Classroom
Ohm's Law: Voltage-Current-Resistance Relationship
Join the resistance—Ohm! Scholars apply Ohm's Law to problems of increasing difficulty as part of a series on electric circuits. The lesson begins with simply doubling and tripling voltage or resistance. It ends with having pupils solve...
Physics Classroom
Know Your Potential
Never underestimate potential—electric or your own. Scholars apply a color scheme based on the changes in electric potential as part of a series on electric circuits. They consider splitting wires, light bulb placement, and voltage as...
Physics Classroom
Resistance Ranking Tasks
Resistance is not futile ... it is voltage divided by current. Scholars apply their knowledge to a series of ranking puzzles. First, they consider wires of varying lengths and then wires of varying cross-sectional areas. Finally, they...
Physics Classroom
Electric Current
Pupils focus on the flow of electricity as they work through three sections of questions as part of a series of lessons on electric circuits. The activities cover the fundamentals, case studies, and law breakers. Learners use conceptual...
Physics Classroom
Light Bulb Anatomy
Scholars apply their understanding of circuits and electric pathways to many simulations. They move through three different activities and 18 questions, receiving immediate feedback after each answer. The lesson is part of a larger...
Physics Classroom
Dots and Graphs
Scholars demonstrate understanding of kinematic graphs through matching dot graphs to position time graphs, dot graphs to velocity graphs, and a mixture of the two. If users feel stuck or confused, a Help Me! button offers an explanation...
Physics Classroom
Position-Time Graphs
Three sections review the key skills covered in a series on dimensional kinematics. The first covers the difference between distance and displacement. The second addresses the relationship between velocity and slope. The third includes...
Physics Classroom
Position-Time Graphs - Conceptual Analysis
Increasingly, colleges and employers want applicants with strong conceptual analysis skills, so give them some practice! Applying these skills to position-time graphs encourages synthesis of knowledge. To complete an installment of a...
Physics Classroom
Match That Graph
Matchy-matchy no longer exclusively applies to fashion. Scholars work through three levels of practice matching position and velocity graphs. Part of a series covering dimensional kinematics, each question provides immediate feedback and...
Physics Classroom
Graph That Motion
Pupils apply their knowledge of the shape and slope of graphs to interpret the motion of an object. Three levels of difficulty provide plenty of practice with support thanks to the "Help Me!" button offered with each question.
Physics Classroom
Motion Diagrams
Scholars work through three activities building motion diagrams as part of a series exploring dimensional kinematics. Each activity has six descriptions requiring application of velocity vectors, acceleration vectors, and challenge...
Physics Classroom
Name That Motion
Pupils apply their understanding of motion to 11 practice problems as part of a series on dimensional kinematics. They view a dot diagram animation and read descriptions to identify which match. As a bonus, the interactive offers...
Physics Classroom
Acceleration
The acceleration rate of a flea jumping works out to 50 times faster than the acceleration rate of the space shuttle. Pupils apply knowledge of acceleration to dot diagrams, velocity-time tables, and word problems. They solve for...
Physics Classroom
Distance vs. Displacement
Home is where your displacement is zero. Scholars practice solving distance versus displacement problems of increasing difficulty. They begin with two stage motion and, by the wizard level, each problem has four stage motion to consider....
Howard Hughes Medical Institute
DNA Sequence Assembly
Oncologists use DNA sequence data to identify specific cancers and offer more targeted treatments. Grasp an understanding of the complexity involved by learning how the body sequences and assembles DNA. Eager scientists explore the...
Howard Hughes Medical Institute
Stopping Mosquito-Borne Disease
Fifty million people catch dengue fever each year. Understanding the transmission and symptoms of this disease helps people prevent and treat it. Learn about multiple intervention strategies and view graphs of their effects to stop the...