Tiny flowers

Took this picture of some tiny yellow flowers growing out of a wall on my way to work.

Work was rather dull, but I did mange to get a few things done - which is always something. After work managed 1400 m in the pool in 32 minutes, which isn't bad going at 44 metres per minute or 0.73 m/s, compared with a world record simmer doing about 2 m/s, or a dolphin cruising at 4.6 m/s...