One million threatened by suspension of Sudan's relief lifeline

One in a million.

Thirty-six years ago, I was the first Cobra Pilot to shake the hand of a surviving Cobra Pilot who lost his tail rotor assembly while on a Hunter-Killer mission in South Vietnam. It was a hot, humid day at Quan Loi. I was an in-country trained Cobra maintenance officer for A Troop 3/ 17 Air Cav and Operation Lam Son 719 had been underway for weeks. The siren went off, which meant one of our Hel...

Navigating One Million Tags

Web 2.0 users engage in collaborative activities. Many 2.0 websites allow their users to associate words (a.k.a. tags) with the users’ own and with other users’ content. The result is an additional layer with descriptions of web resources. The created associations between tag sets and web resources are used to facilitate social navigation, individual resource re-finding, defining communities of...

One million insects--a lot of parasites?

Is Iran threatened by Zika virus?

Zika virus is an Arbovirus identified first time in 1947 in Uganda. Zika epidemic is a threat far greater than the Ebola outbreak. The World Health Organization has urged Asian countries to be vigilant about the risk of spreading Zika virus and preventive measures to control it. In Iran, 64 species of mosquitoes from Culicidea family have been reported three of which belong to the Aedes genus, ...

Landau’s function for one million billions

Let Sn denote the symmetric group with n letters, and g(n) the maximal order of an element of Sn. If the standard factorization of M into primes is M = q1 1 q α2 2 . . . q αk k , we define l(M) to be q α1 1 + q α2 2 + . . .+ q αk k ; one century ago, E. Landau proved that g(n) = maxl(M)≤n M and that, when n goes to infinity, log g(n) ∼ √ n log(n). There exists a basic algorithm to compute g(n) ...