I tried a chocolate-cake recipe with no eggs or dairy that dates back to the Great Depression. Known as "Depression cake," the penny-pinching recipe is useful now due to the high price of eggs.

wartime cake with raisins sliced on a blue plate - Jessica Leyva Alarcon/Shutterstock ...

Two people observing a 3D skull. One of them is touching the eyehole. Credit: Iñigo Ezcurdia UPNA researchers created a 3D mid-air display allowing natural hand interaction with virtual objects using ...