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Health & Medicine

Explainer: The body’s immune system

An army of cells — and their protein arsenal — work to keep us safe. Several squads of special forces possess unique superpowers to disable or kill intruders.

Tech

Scientists Say: Machine learning

Machine learning allows computers to learn new skills without programmers having to write out step-by-step instructions.

Humans

The earliest known pants are surprisingly modern — and comfy

This 3,000-year-old garment was not only stylish but also functional. By recreating it, scientists also unraveled its complex and multicultural origins.

Earth

The Alps’ Matterhorn shows how much even big mountains sway

Such mountain sway data can help planners map high-risk zones for peaks, bridges or any large structures.

Humans

Is the sky really blue? It depends on what language you speak

English speakers talk about color a lot but rarely about smell. Researchers are learning how those who speak other languages sense the world and why differences arise.

Environment

Satellites find big climate threats — ultra-emitters of methane

Eyes in the sky show many of the worst methane emitters are in countries that produce a lot of oil and gas, such as Russia and the United States.

Tech

Teen inventors say: There’s got to be a better way

Finalists in the 2022 Regeneron Science Talent Search are revamping prostheses, earthquake safety systems and air travel.

Earth

Let’s learn about Earth’s secret stash of underground water

Groundwater provides drinking water to billions of people and is used to water crops worldwide.

Science & Society

Instagram influencers promote more unhealthy foods than other celebs

These findings could encourage new social media regulations to protect young users from being bombarded with unhealthy ads, says teen researcher.

Animals

Analyze This: Birds may decorate nests to scare off rivals

Birds that nest in holes face stiff competition for nest sites. Some use feathers, also found where predators have made a kill, to keep rivals away.

Life

Scientists Say: Cellulose

Cellulose is an abundant natural polymer found in plants and algae. It’s used to make everything from paper to clothing.