Our bodies are home to trillions of microbes, including bacteria, viruses, fungi, and a whole host of others. Now, Stanford scientists have discovered an entirely new class of biological entities inside us, which they've ominously named "Obelisks."

Mao began China's infamous Great Leap Forward campaign in 1958. Like all socialist attempts to direct progress, the "leap forward" was a colossal failure. Mao had proclaimed that "progress" demanded eradication of "Four Pests": sparrows, rats, mosquitoes, and flies. He mobilized the population with his "Kill a Sparrow Campaign."

Did you know there are more than 20,000 types of orchids in the world? That's more than four times the number of mammal species! While most are found in tropical rainforests and grasslands in far off places, a fair amount are also native to the United States.