Test your reaction time.
http://www.mathsisfun.com/games/reaction-time.html
My average is 0.171 seconds.
http://www.mathsisfun.com/games/reaction-time.html
My average is 0.171 seconds.
.141 uhuh
best I could do was .219, let me know how you do when you're 70
8O
My daughter is eleven and got 0.249