Do atheists believe in the existence of friendship?

[polymath257]

First, thank you all for taking the trouble to answer my first question by a big YES, though each of you did it by using his artistic talent

Now, it is time for the second question

If two persons stand before you, please let me know how you could be sure that friendship exists in them or not. Thank you.

Naturally, the third question will be based on how each of you will answer this second one

Just by watching them stand next to each other, it might be difficult to determine if there is a friendship or not, especially if you don't have a NMR machine handy. But, if you allow extensive interaction (which is typical for any scientific observation), it should become clear.