"Is there something wrong with asking one's friends to sign up and share their experiences and give us an upvote."
If you aren't aware of why asking your friends to post reviews about your site (without disclosing their relationship to you) is unethical, I'm not sure I can explain that to you.
Early brain scans could help at-risk individuals receive voluntary intervention (medication, therapy etc.) to help them avoid trouble later on. One would hope that the results of these brain scans would be confidential to avoid stigmatizing individuals.
Treating violent and sexual offenders as human beings who are mentally ill instead of writing them off as evil monsters would be a huge step in the right direction for the legal system and society in general.
The amount of lift you would get from such a small amount of helium would be practically negligible compared to the weight of the aircraft. Lighter-than-air craft require an enormous volume of helium/hydrogen - due to the cross-section of such a craft, the speed of travel is severely limited by drag. Basically, an aircraft uses wings OR lighter-than-air gas - it can't use both.
An airfoil (wing) creates lift when air flows from the leading edge to the trailing edge, and the speed of this airflow is one of the factors which determine how much lift is generated. A strong tailwind will interrupt the airflow, induce turbulence and decrease lift. Thus, an airfoil moving into a headwind will generate greater lift than one moving through a tailwind.
I agree that the idea is brilliant, but there is no way I am reactivating my Facebook account to use this. I am sure there are others in the same boat as me.
Could there not be an option to receive matches/invitations via email?
"All this stuff about being born on the wrong side is misleading, because the difference between the two sides is not natural resources or something* but the people themselves."
Would you care to elaborate on this? In contrast to other segments of your comment, it appears to be incredibly ignorant and chauvinistic, at least to me.
Your entire comment reeks of privilege. Many of the people who end up in prison are the homeless people who were getting kicked, robbed and beaten, that you ostensibly care so much about. It is a well-known fact that the poor are severely disadvantaged in the legal system.
Also, your implication that someone who goes to jail for hurting a child deserves to be assaulted (sexually or otherwise) by other prisoners is obnoxiously offensive and ignorant. Abuse or neglect is not conducive to rehabilitating prisoners, so unless you want these people to recidivate (and possibly hurt more children) after their release, you may wish to reconsider your opinion.
Ahhh, this old chestnut. It does not take "faith" to believe that something does not exist. There are literally an infinite number of things that you believe do not exist, simply because there is no evidence that they do. For example, if I told you that there is an invisible elephant in the boot of your car right now, would you consider yourself on the fence as to whether I was telling the truth? Or would you simply reject the idea as absurd, until shown evidence to the contrary?
Agnosticism is fine, but for people who place the burden of proof on those who make extraordinary claims, atheism is not a faith-based decision.