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UNESCO says the figure could reach four million by 2030 unless Taliban reverses policy. Destaque: 2.4 mi.

A vaccine only protects a whole community if enough people get it, including those who would stay safe anyway once their neighbors are covered. The same tension runs through climate action and social movements: The shared payoff arrives only when enough people pitch in.

A coalition of farmers, consumer associations and environmental groups is urging Malaysia's National Biosafety Board to reject a proposed field trial of genetically modified rice, warning Tuesday the project could pose risks to food safety, the environment and farmers.

Researchers say a spike in temperatures during an ice age 304 million years ago could inform what climate scientists are learning about rapidly changing conditions today. Destaque: 304 mi.

For years, schools have posted photos of their pupils online. But could they be misused?

The rulings could affect Indigenous land rights, soya farming and environmental safeguards across the Amazon rainforest.

What if certain signs of the disease were to manifest subtly during sleep, long before the first memory problems appear? This is the line of inquiry being explored by a team of researchers at ULiège.

Phone and Bluetooth signals could turn roadside cameras into far richer tracking tools.

Hot hours of summer could triple in the coming decades.

In Alzheimer's disease, amyloid plaques form in the brain, followed by threadlike structures made of the protein tau.

Two research teams have independently created devices within which sound waves could be separated by frequency, creating the most complete sound rainbows yet.

Older adults could be scrambling for new health coverage next year, especially in rural markets that have fewer insurance choices.