Sclerosponges may hold new keys to marine paleoclimate

Who should hold the keys to your DNA?

New oceanic proxies for paleoclimate

Environmental variables such as temperature and salinity cannot be directly measured for the past. Such variables do, however, influence the chemistry and biology of the marine sedimentary record in a measurable way. Reconstructing the past environment is therefore possible by ‘proxy’. Such proxy reconstruction uses chemical and biological observations to assess two aspects of Earth’s climate s...

Modeling Alien Invasions: Plasticity May Hold the Key to Prevention

The history of life is fi lled with examples of one species diverging into several, even thousands, each with unique traits geared to the demands of its ecological niche. In the textbook case of adaptive radiation, an ancestral fi nch species landed on the Galapagos Islands just a few million years ago, and evolved into 13 new species with specialized beaks adapted to exploiting the various see...

PPP May not Hold for Agricultural Commodities

We use the well known USDA dataset of real exchange rates to address the question of whether PPP holds for agricultural commodities. Both unit root tests and the recently proposed more powerful class of panel unit root tests, which take into account cross-section correlation across the units in the panel, are used. Properties of unit roots and panel tests are analyzed by Monte Carlo simulation....

New weak RSA keys

Let N = pq be an RSA modulus with q < p < 2q. In this paper, we analyze the security of RSA with the class of the exponents e satisfying an equation eX −NY = ap + bq + Z with |a| < q, b = ⌊ ap q ⌋ , X < N 3|ap + bq| and |Z| < |ap− bq| 3|ap + bq| N 1 4 , where bxc is the greatest integer less than or equal to x. Using the continued fraction algorithm and Coppersmith’s lattice reduction method fo...