U.S. temps in June 2013 were 2 degrees above 20th Century average. U.S. West was fighting wildfires while the U.S. East saw below average temps and rain, rain, rain.
Researchers are able to make particles, liquid droplets, and even toothpicks fly in mid-air by letting them ride on acoustic waves. For the first time, they can also control their movement.
A collaborative team has developed a new biometric authentication technique that identifies people based on their eye movements. This new technique could one day replace online passwords if made user-friendly.
The United Nations says global human population reached 7.2 billion in mid-2013. The "medium-fertility" projection for the year 2050 has been revised upward to 9.6 billion.