Fri 20/11/15
1) It is really good to see young people playing on the forum again - it has been a while.
Unfortunately you are all anons. Please join up or at least use names in your posts so that people can get to know you. You will find it a lot better that way, really you will. 
http://web2.0calc.com/questions/riddles_1
2) Some terrible things have happened in the world recently but here is an interesting unbiased look at terrorism.
Thanks Dragonlance.
http://web2.0calc.com/questions/ok-so-u-think-its-personal-problems-how-about-my-country-called-canada-is-refugees-and-my-people-are-scared-of-terrists-how-would-you-feel-thtas-what#r2
3) How pairing numbers can make addition much easier. Great demo from Heureka,
http://web2.0calc.com/questions/im-stuck-in-this-koobits#r3
4) What should the answer be if I press 9 [+/-] [ x2 ] on the calculator?
http://web2.0calc.com/questions/hey-moderators
5) How many push ups must the tired squirrel do?
Thanks Rom. 
http://web2.0calc.com/questions/science_17491
6) Binomial Probability - I think it is right.
Melody
http://web2.0calc.com/questions/probability-question_3
7) Mellie questions - geometry Not answered.
I would have answered at least some of these earlier but they disappeared!
It was really weird. I thought I saw one very early today but when I looked for it later I could not find it - and I spent a fair amount of time looking too. This happened to me last time Mellie posted too. I look for icons, maybe her icon does not always display? It is a real puzzle to me. Anyway, none of these have been aswered yet. Maybe they were hidden from other people as well ???
a) http://web2.0calc.com/questions/a-square-and-an-equilateral-triangle-have-the-same-perimeter-let-abe-the-area-of-the-circle-circumscribed-about-the-square-and-b-be-the-area-of-the-circle
b) http://web2.0calc.com/questions/let-m-be-the-midpoint-of-side-ab-of-triangle-abc-angle-bisector-of-ad-of-angle-cab-and-the-perpendicular-bisector-of-side-ab-meet-at-x-if-ab-40-and-mx-9
c) http://web2.0calc.com/questions/find-the-circumradius-of-triangle-jkl-if-kl-16-and-jk-jl-17
d) http://web2.0calc.com/questions/find-the-inradius-of-triangle-jkl-if-jk-jl-17-and-kl-16
e) http://web2.0calc.com/questions/let-ab-6-bc-8-and-ac-10