Re: Facebook: See if someone is online but not your friend. You can't see if someone is online or not if they arent in your friends list. and even if the account is private you should still be able to send a friend-request or a message. If you think she is cheating on you, you have more than just a facebook problem ..
A â 0.22 (meters per beat) U â 3*15*0.22 â 9.9. ... to estimate that the airspeed velocity of an unladen European Swallow is 10 meters per second. With some further study, it became clear that these estimates are accurate, though perhaps coincidental.
Actually, wrong. By comparing the European Swallow with bird species of similar body mass, we can estimate that the swallow beats its wings 18 times a second with an amplitude of 18 cm: Note that even the tiny Zebra Finch flaps its wings no more than 27 times a second while cruising.