Sometimes, instead of helping people to advance, a discovery or an invention holds them back.

It was not until we saw the picture of the earth, from the moon, that we realized how small and how helpless this planet is - something that we must hold in our arms and care for.

It is not until science has become a discipline to which the research ability of any mind from any class in society can be attracted that it can become rigorously scientific.

Earth Day is the first holy day...and is devoted to the harmony of nature... The celebration offends no historical calendar, yet it transcends them all.

No skill, no special apti­tude, no vividness of imagination or precision of thinking would go unrecognized because the child who possessed it was of one sex rather than the other. No child would be relentlessly shaped to one pattern of behavior, but instead there should be many patterns, in a world that had learned to allow to each individual the pattern which was most congenial to his gifts.

There is no greater insight into the future than recognizing...when we save our children, we save ourselves

I had my father's mind, but he had his mother's mind. Fortunately, his mother lived with us and so I early realized that intellectual abilities of the kind I shared with my father and grandmother were not sex-linked.