they are doing a great work by donating rice to the the needy. actually, it gives dual benefit as it donates rice to the poor and add knowledge to people who give answers.
This is a trustworthy, good, and child suitable site because from my experience and to the best of my knowledge, it has generally acceptable advertisements, donates part of the ad-revenue to charity, trains one's vocabulary, knowledge, and/or problem solving skills, it is not involved in any phishing or scamming schemes, and does not host any malware.