Dreams of Earth and Sky; Birds and Frogs: Selected Papers, 1990–2014Dreams of Earth and Sky, Freeman Dyson, New York Review of Books, 2015. $27.95 (298 pp.). ISBN 978-1-59017-854-6 Buy at AmazonBirds and Frogs: Selected Papers, 1990–2014, Freeman J. Dyson, World Scientific, 2015. $58.00 (223 pp.). ISBN 978-981-4602-85-3 Buy at Amazon