In regressive evolution, organisms lose complex features and can appear to evolve "in reverse." But evolution doesn't retrace its steps, experts said.
The black hole wrapped the layers of the shredded star around itself to form the perfect doughnut of doom.
Researchers discovered that six psychiatric disorders seemed linked to the same underlying brain wiring.
The characteristic zigzag pattern of lightning is caused by a highly conductive form of oxygen that builds up as the bolt travels toward the ground.