articles

Un misterio de hace tiempo es que, a pesar de las persistentes emisiones de gases de efecto invernadero a lo largo de los siglos XX y principios del siglo XXI, la temperatura de la superficie promediada a nivel mundial ha mostrado fluctuaciones decadentes distintas desde 1900, incluyendo dos frenadas de calentamiento global a mediados del siglo XX y principios del siglo XXI y dos fuertes aceleraciones del calentamiento global a principios y finales del siglo XX. 

The plant disease fire blight, caused by the bacterium Erwinia amylovora, is dreaded by fruit growers. It affects apple and pear trees and other plants in the rosacea family, and if a tree becomes affected it usually has to be cleared and burned.

Tropical Storm Merbok formed in the South China Sea west of the Philippines on June 11 and made landfall east of Hong Kong, China on June 12. NASA measured the rainfall rates within the tropical storm early in its short two day lifetime.

Most business and leisure travelers in the United States can’t identify a bed bug, and yet the tiny pest evokes a stronger response in hotel guests than any other potential room deficiency—putting the hospitality industry in a difficult spot.

Present-day Mars is a frozen desert, colder and more arid than Antarctica, and scientists are fairly sure it’s been that way for at least the last 3 billion years. That makes a vast network of water-carved valleys on the flanks of an impact crater called Lyot — which formed somewhere between 1.5 billion and 3 billion years ago — something of a Martian mystery. It’s not clear where the water came from.