"TIL Andre Agassi won 10 of 11 matches after seeing a "tick" in Boris Becker's serve. Agassi could predict where Becker was serving based on whether Becker stuck his tongue out in the middle of his lip or to the left corner of his lip. Agassi told Becker over a pint of beer - after they retired."
from Wikipedia
Amount of elements by percentage
Part examined
Copper Tin Lead Iron Sulfur Arsenic
Blade 80.3 18.8 0.4 0.4 trace trace
Yellow pattern 83.1 15.2 0.8 0.8 trace trace
Dark pattern 73.9 22.8 1.4 1.8 trace trace
Darkest regions 68.2 29.1 0.9 1.2 0.5 trace
Edge 57.3 29.6 8.7 3.4 0.9 trace
Central ridge 41.5 42.6 6.1 3.7 5.9 trace