was a test between a football filled with regular air and Hot older ladies looking dating african girls one filled with helium though. They let a punter punt both of them several times, but he didn't know which was which. The one with regular air actually went farther. It was interesting, but not very scientific since he was bound to have hit them with a little different amount of force each time. Maybe mythbusters

it should be stated in "weeks pregnant" because that is how you really know. And that is the way MD, nurses, and the mom speak of pregnancy in this century. Your cut off should probably be no later than 30 weeks-40 weeks is full term. A born between 25 and 34 weeks need a lot of help. A born before 30 weeks is really likely only to survive in a neo-natal intensive care unit. Most women labor for 6-10-24 hours (less with medication at hospital). Though some of the premature births are faster partly due to small. Most pregnant women do not want to give up all fun activities for most of their pregnancy. The proportion of women delivering prior to 30 weeks is very small. Someone stating they are 7 months be anywhere from 26 weeks to probably 34 weeks. (Calendar months vs lunar months-10 lunar months in pregnancy). Signing some sort of waver would be in order! Perhaps with a cost estimate for a Coast Guard evacuation to hospital (like an airline having to land for medical emergency).