Short-form video-sharing apps have been around for a few years now without catching on in any substantial way.

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Don't forget, however, that IBM also pays a substantial dividend, and pays out further dividend-like cash in the form of share repurchases.

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The G-quadruplex seems to form in DNA where guanine exists in substantial quantities.

BBC: 'Quadruple helix' DNA seen in human cells

Ultimately, the investment could generate substantial returns for the federal government in the form of lower energy costs for the more than half-million buildings it oversees.

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