Biology

Learn how sound travels in waves and how it is measured in this backgrounder.

Learn about the properties of materials and the challenges of cleaning up an oil spill in this activity.

Explore the greenhouse effect and learn about the impacts it can have on the environment.

Water is a precious natural resource. What happens if it gets polluted? Learn how water can be cleaned with this hands-on activity?

Learn about the chemical reaction that happens between acid rain and limestone.

Biofuels like ethanol might help fight climate change. But they can contribute to food insecurity and greenhouse gases in ways that might surprise you.

Many people have had children using assisted reproductive technologies. But some of these medical biotech techniques can raise some ethical issues.

10 images showing some scenes with coniferous and deciduous trees in the fall or autumn season

10 images of some coniferous and deciduous trees showing new growth in the spring season

9 images showing some scenes with coniferous and deciduous trees in the summer

10 images of various winter scenes showing some coniferous and deciduous trees in snowy conditions

What is the nitrogen cycle? How do human activities such as using fertilizer affect the nitrogen cycle? How can this cause greenhouse gases?

Teen brain development prepares teens for adulthood, but also affects their emotions.

14 images of some plants such as carrots, cabbage and leeks whose roots, stems or leaves are used for food

Viruses can make you feel awful! This article explains how feeling bad might be your immune system’s way of helping you heal.