Is there anything that contains hydrogen that is not a fuel? Yes, there is
water, the weight of which is one-eighth hydrogen. (1) that (2) out of water
10
(3) energy (4) takes (5) is (6) the only trouble (7) ripping the
hydrogen. Plants do it by means of photosynthesis, which makes use of
sunlight as a source of energy. Scientists are searching avidly for some way of