A puddle on a warm sidewalk is gone by the afternoon, and none of it ever boiled. Water molecules at the surface are always moving at different speeds, and the fastest o them esc into op air. Ea escape dra some ene, so wh stays beh must b a lit cooler, which is why wet skin feels cold. Wind helps because it sweeps the escaped molecules away before they can fall back in. A cover slows the same puddle down for days.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.