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Scientists predict that, by 2060, one million U.S. adults per year will develop dementia. The new estimate surpasses previous estimates of how many people will struggle with memory, reasoning and language difficulties that interfere with life.

Exposure to germs triggers an immune response. But just thinking about germs might do it, too, new data show. Researchers used virtual reality to study how people respond to sickness in others. Learn techniques and tools researchers use to study how we respond to illness at three levels of biological organization — the behavioral, physiological and chemical. Answer questions about experimental variables, then discuss possible applications for virtually boosted vaccines of the future.

Some plants have evolved to produce putrid scents. Consider the phenomenon of smell before doing a card sort to show the biological and chemical processes happening in these plants. Then, answer questions about why and how the plants evolved to increase their stench.

Shortages and big price tags have driven patients to unconventional, sometimes shady sources of weight-loss drugs. In some cases, people end up with tainted drugs or risk overdosing.

The sympathetic nervous system — our fight-or-flight response — kicks in when we face a big challenge or risk. When we’re relaxed, our parasympathetic nervous system takes over. Together these two systems make up the autonomic nervous system.

Virtual reality (VR) has expanded people's ability to experience visual and auditory sensations in virtual worlds. What about our other senses? Learn how chemical-detection capabilities of the tongue allow us to taste cake as being sweet and lemonade as being sour. Explore how scientists used this understanding to develop taste-mimicking VR technology, all while answering questions about how this tasty research might one day help people.

Alcohol-related deaths have increased yearly over the last 20 years. From 2019 to 2020, in the first year of the COVID-19 pandemic, the death rate from alcohol use rose sharply — at a much greater rate than in recent years.

New discoveries about the natural world can inspire the design of human-made objects. In this activity, students will learn about how the overlapping feathers on birds’ wings prompted engineers to reimagine the design of aircraft wings. Students will explain how this is an example of bioinspired design and then create their own bioinspired designs.

Use this activity to have your students collect, graph and analyze anonymous class data about where different emotional responses are felt in their bodies. Then compare the class data with the findings of two recent studies, one collecting modern data and the other drawing on ancient data. To better understand why people experience emotions in different areas of the body, have students explore the physiological chains of emotional responses.

Students will review the components of respiration and photosynthesis reactions to illustrate how the two are complementary. Then students will investigate what impact megafire smoke may have had on photosynthesis for California nut trees. Then students will apply their knowledge by predicting the outcome for photosynthesis and respiration in several scenarios.

Learn how scientists use vampire bats' unusual locomotion to investigate mysteries of their blood-based metabolism. Then, answer questions about this study’s experimental design and discuss how chemical analysis data can support conclusions and answer scientific questions.

Students will learn how their bodies help protect them from bacteria, viruses and other foreign invaders. Have students review the major components of the immune system and investigate the life cycles of a few prevalent pathogens of polar bears, focusing on the mode of transmission and effects of being infected by the pathogen. Students will then infer why polar bears are being exposed to these pathogens more regularly.