The impact of an asteroid or comet is acknowledged as the principal cause of the mass extinction that killed off most dinosaurs and about three-quarters of the planet's plant and animal species 66 million years ago.
Earth Sciences
Dec 16, 2019
2
3416
Australia's biggest city is facing a "public health emergency" over the bushfire smoke that has choked Sydney for weeks, leading doctors warned Monday after hospitals reported a dramatic spike in casualty department visits.
Environment
Dec 16, 2019
0
39
You might think that prey would invariably flee in terror from a predator. But what if an animal was apathetic in the face of danger?
Plants & Animals
Dec 16, 2019
0
245
A new statistical analysis of data from a long-term study on the teaching of mathematics and science has found that smaller class sizes are not always associated with better pupil performance and achievement.
Education
Dec 16, 2019
0
202
