The circumference. Just like other objects.
Answer:
Physical contact
Explanation:
Mostly through phsyical contact. Hugging, shaking hands, kissing, etc..
Touching raw foods and then touching objects without washing your hand. Then someone comes along and touches that door knob and touches their face
You should wear tight compression outfits to decrease the possibility of drag, especially in an olympic race. You could even wear a swim hat to lower drag from your hair.
1/2 I think because it is supposed to be 50% which is basically 1/2.
