Howard Hughes Medical Institute
Beaks as Tools: Selective Advantage in Changing Environments
How does nature select some adaptations over others? Scholars experiment picking up seeds with two different types of tools simulating beaks. After practicing, they experience a drought where one type of seed suddenly isn't available....
Howard Hughes Medical Institute
Using DNA to Explore Lizard Phylogeny
On the Caribbean islands, lizards expanded into different niches instead of competing for resources. Scholars discuss and learn from experts in a video how scientists prove the theory. They build phylogenetic trees based on appearances...
Howard Hughes Medical Institute
Evolution in Action: Data Analysis
An environmental factor, such as a drought, sometimes speeds up the rate of natural selection. Scholars analyze data on the beaks of birds around the time of the drought. They compare those that survived to those that perished and find...
Howard Hughes Medical Institute
Lactose Intolerance: Fact or Fiction
Around the world, about 2/3 of adult humans are lactose intolerant. Scholars work in small groups to discuss a few statements about lactose intolerance. Then, they watch a video on the topic and readdress each statement. Whole-class...
Howard Hughes Medical Institute
Got Lactase? Blood Glucose Data Analysis
Many physicals include a blood glucose test, but what are doctors actually testing? Scholars graph and interpret blood glucose data, allowing them to observe the differences in lactase persistence and draw conclusions. They then connect...
Howard Hughes Medical Institute
Finding the Crater
A mass extinction event caused by an impact usually leaves a crater. Scholars use data from 10 different sites around the world trying to determine where to look for the crater. They use data, listing the amount of various minerals to...
Howard Hughes Medical Institute
Using Genetic Crosses to Analyze a Stickleback Trait
Two fish appear different, but how do scientists determine their genotypes? Scholars practice performing test crosses to determine the genotypes of fish given their phenotypes. They answer in-depth comprehension questions and complete...
Howard Hughes Medical Institute
Modeling the Regulatory Switches of the Pitx1 Gene in Stickleback Fish
Gene switches work similarly to light switches in controlling one feature of their environments. Scholars study the Pitx1 gene in a specific type of fish. They learn the different ways this switch controls various body parts and...
Howard Hughes Medical Institute
Stickleback Evolution Virtual Lab
How quickly do animals evolve? Can comparing different samples of the same fossil answer timeline questions? Scholars use virtual labs to examine fossils and learn about stickleback evolution. They compare pelvic morphology in lakes...
Howard Hughes Medical Institute
Mendelian Genetics, Probability, Pedigree, and Chi-Square Statistics
People with the sickle cell trait, but not sickle cell disease, find natural protection against malaria. Scholars consider various combinations of genotypes and environmental factors to determine if children might have sickle cell...
Howard Hughes Medical Institute
Determining the Size and Energy of the K-T Asteroid
Two different groups of scientists published scientific papers in 1980 offering proof of a large asteroid hitting Earth between the Cretaceous and Tertiary layers of ground. Scholars use a worksheet to analyze the same type of data as...
Howard Hughes Medical Institute
Classroom Activities: EarthViewer
The spot you are standing in right now—how did it look 2,000 years ago, one million years ago, or even four billion years ago? Scholars use a model of Earth throughout history to learn about continental drift, climate change, changes in...
Howard Hughes Medical Institute
EarthViewer Climate Guide Activity
What did Earth look like 4.5 billion years ago, and what was the climate like then? Scholars explore a view of Earth throughout history. They observe continents moving, temperatures fluctuating, and huge changes in ecosystems. A...
Howard Hughes Medical Institute
Distribution of Elements in Earth’s Crust
How do scientists know the difference between a meteorite from space and a regular rock from the earth? Scholars read a passage and answer comprehension questions about the creation of the solar system. They extrapolate the main ideas to...
Howard Hughes Medical Institute
Calculating Iridium Fallout from an Asteroid Impact
Should we be afraid of a large asteroid impact on Earth today? Young scientists estimate the size and composition of an asteroid similar to the one that caused the K-T mass extinction. They apply algebraic formulas to answer questions...
Howard Hughes Medical Institute
Reading Primary Sources: Darwin and Wallace
Take your classes back in time. Learners read real historical texts from both Darwin and Wallace as well as an announcement of their findings. Using guiding questions, they make inferences and draw conclusions from the information in the...
Howard Hughes Medical Institute
Look Who's Coming for Dinner: Selection by Predation
What happens when a new predator comes to town? Learners analyze an experiment that studies the effect of predation on selection. They use real data to draw conclusions about the impact a new predator has on a prey species.
Howard Hughes Medical Institute
Exploring Biomes in Gorongosa National Park
Diversity in a biome leads to some unique characteristics vital to the natural environment. Young scholars use an interactive map to explore the vegetation and climate of the Gorongosa National Park. They collect climate data to compare...
Howard Hughes Medical Institute
How Did Dinosaurs Regulate Their Body Temperature?
Are dinosaurs more like birds or reptiles? Learners put the question to the test by analyzing body temperature data from a 2014 study. With their analysis, they develop a theory about the body temperature regulation of dinosaurs.
Howard Hughes Medical Institute
The Making of a Theory—Fact or Fiction
Two scientists, two independent studies, two similar theories! A video lesson presents the work of Charles Darwin and Alfred Wallace that led to their theories on evolution. Scholars then evaluate statements and provide evidence to...
Howard Hughes Medical Institute
Living Dinosaurs: Fact or Fiction?
Are birds descendants of dinosaurs? Learners consider the question as they watch an informative video comparing fossil records of dinosaurs with current species. Following the video, groups ponder the evidence to draw conclusions about...
Howard Hughes Medical Institute
Creating Chains and Webs to Model Ecological Relationships
The sustainability of an ecosystem depends on many factors and changes constantly. Young scholars consider these factors as they use a set of cards to create food webs. They review key scientific vocabulary such as predator, prey,...
Howard Hughes Medical Institute
Weighing the Evidence for a Mass Extinction: Part 1 – In the Ocean
Extinction events have happen throughout geologic history, but only five mass extinctions occurred over the last 4.5 billion years. Scholars view fossils from a layer of sediment during an extinction event and observe patterns to draw...
Howard Hughes Medical Institute
Winogradsky Columns: Microbial Ecology in the Classroom
Substances that decompose with the help of living organisms do so at different rates. Scholars experiment with Winogradsky columns to determine the rate of decomposition, the oxygen and sulfide content changes, and bacteria levels. The...