Those profit motives range from state funding in exchange for proof of higher school attendance (a clear factor behind the rapid adoption of radio-frequency identification (RFID) tracking badges in certain Houston schools), to increased revenue from fines and more bodies in the jails.
Sun, et al., Design study of a transverse-to-longitudinal emittance exchange proof-of-principle experiment, in: Proceedings of PAC-2007, Albuquerque, NM, USA, 2007, pp. 3441 3443 [1]].
Mr Arad has long been presumed dead, and the government says Mr Goldwasser and Mr Regev probably are too.Some newspaper pundits praised the exchange as proof of how highly Israel values its soldiers, even when dead.
Yesterday's muted exchange is proof of it.
But targeted integration in Drosophila cell lines has proved difficult, and to our knowledge, the system has been pursued in only three laboratories: The Perrimon laboratory placed MiMIC elements, an enhancer-trap version of a phiC31 docking site, into S2R+ cells, and briefly described an integrase-mediated cassette exchange as a proof of principle (Neumuller et al. 2012).
Upon exchange, CryptoRubles will reportedly require some kind of proof of origin, such as (presumably) a documented retail transaction or service rendered.
At another point, the story seemed to be about high and impeachable crimes like the ones we have had some experience with: the suborning of federal agencies; the exchange of billion-dollar contracts for proof of indiscretion; the extermination of infants in illegal wars mounted and waged for money and power.
Hiccups in the law's implementation (e.g. the initial failures of www.healthcare.gov, the website for federal exchanges ) became proof of its unworkability.
They go back to the 1930's, when brands like Ovaltine offered radio listeners "secret decoders" and other prizes in exchange for saving proofs of purchase.
Some retailers will offer an exchange even without proof of purchase, but it is likely to be at the most recent price.
