Arthur C Clarke, science fiction writer and science popularizer, died in Sri Lanka earlier this week. He leaves with us an extraordinary legacy of entertainment and inspiration. In a final public message, available for you to view below, he mentioned that the power of our technology does not displace the importance of tolerance and compassion. Humanity should learn to think and act as one family. Couple this compassion with optimism, and we may yet realize and exceed the far-sighted visions expressed in Clarke's writings. This is a hope worthy of our faith.