Kelleher calls him a "bottom-up thinker, " which for Kelleher is almost a light knock.

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Sandwiching the solar cells inside the device would block some light out and knock down power conversion efficiency even further, Filler cautioned.

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Neutrons ejected from a watery surface move much more slowly than those from a rocky one, because the hydrogen nuclei in water are light enough for an exiting neutron to knock around much like one billiard ball hitting another a process that slows the neutron down.

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The pieces have an Egyptian look and mirrored sides that bounce light from a low-powered diode laser at one another and consequently knock each other out of the game.

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But the visitors made relatively light work of their reply, largely thanks to Trott, whose 50-ball knock contained three fours and a six.

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