The World Health Organization is urging countries to significantly raise the price of tobacco, alcohol and sugary drinks to cut chronic disease. It proposes an increase of at least 50 percent over the ...

能喷毒的蛇，毒牙有特化的出口，可以引导毒液向前或向上喷射，最远能射出2.5米。最可怕的是它们还会瞄准人眼睛，被射中会引发剧痛、严重发炎，甚至可能永久失明。然而，这件恶毒的武器，对于蛇的捕食却收效甚微，因此有科学家猜测：喷毒产生于毒蛇和人类祖先的军备竞 ...