As part of their ongoing "What If?" series, Randall Munroe of xkcd and Henry Reich of MinutePhysics explain what would happen if a glass was literally made half empty due to vacuum pressure.

As part of their ongoing "What If?" series, Randall Munroe of xkcd and Henry Reich of MinutePhysics explained what might happen if all of the oceans on Earth were drained and then teleported to Mars.

The humorous plots in his xkcd webcomic are one of the favorite parts for many readers. Their distinctive, Tufteian style delivers the information – in this case, a punch line – without ...