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Figure 1. The arrangement of hydrogen atoms (black circles) about oxygen atoms (open circles) in ice. Two hydrogen atoms (bottom ones) are close to the central oxygen atom while two of them (top ones) are far and closer to the two other…
A tulip, known as "the Viceroy" ( viseroij ), displayed in the 1637 Dutch catalogue Verzameling van een Meenigte Tulipaanen ("Collection of a Crowd of Tulips"). Its bulb was offered for sale for between 3,000 and 4,200 guilders (florins)…
Poster symbolizing the Ele Não Movement.