An acronym describing certain experiments where, for example, half the subjects are chosen by chance to get the treatment and half get a placebo
5D
Novelist Virginia who wrote that had Shakespeare had a sister of equal genius, she "would certainly have gone crazed, shot herself, or ended her days in some lonely cottage outside the village, half witch, half wizard, feared and mocked at"
6D
Lots and lots, or the weight of about half a white rhino