I can access it pretty ok (as in I'm not having the same problems as others are having) so what is it you want to know? if it is about the overall look it is very colourful and a lot of the colours contrast but at the same time it is a site for younger people so I can see how that would appeal to them so thats probably OK. It is a science website so the links on the left side that are all different colours I'd actually change the colours around, they are all the colours of light if you break it in a prysim but they are all mixed up, instead from top to bottom make them Red, Orange, Yellow, Green, Blue, Indigo, Voilet and it will visually create consistancy even though people won't know why.
Other than that the only thing is on the index page there is a lot of stuff loading which is probably why so many people have problems opening it, assuming you have some input on this site and thats why you are asking, I would take move some of the content from the index page to a different part of the site because the site is for "Young Social Innovators" and most kids that age now a days access the internet from their phone anyway so to much content like that could take so long to load that they would get bored waiting.
As I said I've no idea why you are asking but thats just personal observations based on the assumption that you have something to do with the design of the site and were asking for some constructive critisim