The womens 4 x 1 world record of 40.82 is going down later on this week. Jamaica is going to run 40.60 with the top 3 medalist in the 100m. Oh and if u think they only have 3 100m runners. Remember young sensation Brianna Williams coach by Ato Bolton. Sorry USA. The green ,gold,and black is gonna take down the WR. Mite dip under 40.50....