Headphones are not just bad for your hearing. Did you know wearing headphones for just an hour will increase thebacteria(细菌) in your ear by 700 times? ……

Did you know what they talked about at the meeting?No. They've trying to keep it hush-hush.hush-hush:秘密，秘密的 ……

菠菜其实含有丰富的维生素A。Most people know that spinach is a good source (来源) of iron (铁). But did you know that it is actually richer in vitamin A? ……

Did you know you've been assigned to work with Richard on the group project? I can't accept that. He loves to boss people around.boss around: 颐指气使 ……

Help the cat reach the fish. Help the cat reach the fish.   Did you know?Did you know?1. Seahorses are the only fish that can swim upright.1. Seahorses are the only fish that can ……

汉语拼音60年：它如何改变了你我的生活？PAGES 4-5Pinyin has helped millions of Chinese learn to read, as well as made typing more convenient. But did you know that pinyin has only existed for 60 years? ……

Help the bear get to the bank!Did you know? 1. The oldest bank in the world is Monte dei Paschi di Siena in Italy. It opened in 1472.2. China was the first country to use paper money. The earliest ……

colors but their main colors are yellow, pink, orange and white.Did you know that tulips have an underground stem (地下茎)?Did you know that tulips and onions reproduce by bulbs (用球茎繁殖)?All tulips grow from ……

QIANTUQIANTU蜗牛：世界上牙齿最多的动物。蜗牛：世界上牙齿最多的动物。Snails look soft and sticky (粘的). But did you know? Snails... a snail have? It’s your turn to count (数)! TEENSSnails look soft and sticky (粘的). But did you know ……

丑陋的建筑有害健康丑陋的建筑有害健康Buildings are everywhere in our city. But did you know? They can affect (影响) our... are everywhere in our city. But did you know? They can affect (影响) our health. Looking at some ugly buildings ……

The man: You didn’t brush your teeth this morning.The lion: How did you know that?The man: I smell garlic (大蒜).– Ye Baihe of Xi’an, Shaanxi The lion: You look worried, master.The man: Where can I ……

Pets on the CouchNicholas DodmanYou may have already seen the movie The Secret Life of Pets, and know that animals’ minds and emotions can work in a similar way to our own. But, like us, did you know ……

郭采洁推出全新专辑。MANY of you may know Amber Kuo from the Tiny Times (《小时代》) films. The Taiwan actress plays the cool girl Gu Li in the movies. But did you know that Kuo, 29, is also a singer? On Dec 25, Kuo ……

同样的时间，不同的季节Did you know Australia and China have opposite (相反的) seasons? When it is summer... I was freezing, now I know how to dress warmer. Soon it will be summer here and winter in Australia. ……

百变“瑜伽猫” YOGA is a fun but difficult sport. You must have a very flexible (柔软的) body. But did you know that some cats can do yoga too? An America photographer and his wife posed (给……摆动作) these cats ……