On the ground, viewers in the full shadow's path-aka the path of totality-see the moon cover the sun's disk for several minutes. Only the sun's faint upper atmosphere, or corona, remains visible.

Crank up the power, and it can emit a warning tone so loud that anyone in its path would have no choice but to cover their ears and run.

Marika Holland: we're still on this path of decreasing sea ice cover, but if things were stabilized in terms of greenhouse gas concentrations, we might be able to stabilize the sea ice cover as well.