Top news for 2021-04-16

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Highly dense urban areas are not more vulnerable to COVID-19, researchers say

On the pulse of pulsars and polar light

NASA's New Horizons probe reaches rare distance, looks out to farthest Voyager

Triangular-shaped spikes key to coronavirus transmission, finds new study

Research shows to disrupt online extremism freewill is key

How are asteroids, space weather and space debris detected before they hit Earth?

A rich marine algal ecosystem 600 million years earlier than previously thought

Experiments cast doubts on the existence of quantum spin liquids

What the Oldest Known Cave Painting Reveals About Early Humans (and What It Doesn't)

Surprise twist suggests stars grow competitively