1 . Bees are known to tell time by light and social clues. Now, researchers have shown that the biological clocks of bees can be changed by another surprising factor: temperature cycles inside the hive （蜂巢）.

The researchers tried to better understand how bees lived in areas beyond where light entered the hive.They were surprised to find clear temperature fluctuations across the day throughout the hive, which was caused by daylight.

To understand how important this temperature cycle was to a bee's activity, the researchers put bees in total darkness all the time while exposing them to the temperature cycles they observed within the hive. Six days later, the scientists moved the temperature cycle back by six hours. “We saw that the bees changed their activity with the temperature, meaning their daily routines were reactive to temperature,” a researcher said.

The discovery that bees can tell exact time from temperature cycles inside the hive shows that on a cloudy day or when bees aren't going outdoors, they have other means to tell time exactly. This will affect the way that researchers understand, explain and combine what they know of bee behavior.

More broadly, as more extreme weather events occur around the world, bees will face challenges to continuing the activities that keep them and the agriculture they support healthy and energetic. If part of the southern U.S. is hit with an unexpected snowstorm, bees getting ready to search for food might not realize they need to save energy and heat the hive. In the event of a 100-degree day, bees will have to spend a lot of energy keeping the hive co. It is those considerations that will influence hive health or possible hive breakdown.

"We want to see how important this research is this winter in Tennessee，when bees aren't leaving the hive as much," researchers said. "We will be interested to see how our findings apply to zones where temperature varies more greatly across the year." This research will also reshape how researchers think about bees' biological rhythms.

2 . No matter how old you are, spending the night high up in the trees is an exciting idea. And with nature holidays becoming ever more popular, we’ve put together a list of some jaw-dropping reserves   (度假区) from around the world to add to your travel wish list.

Leopard Hills Private Game Reserve — Sabi Sand Game Reserve, South Africa

Sitting high above the South African forest, this impressive reserve owns private decks with swimming pools overlooking the whole reserve. Every day, tourists can take trips on dirt roads to sec wild animals like lions and elephants in the area. Nighttime lets you catch a sight of nocturnal animals, which are active only at nights, coming right up to the reserve's doorsteps.

Tree House Lodge— Puerto Viejo, Costa Rica

Live your best Robinson Crusoe lift at the Tree House Lodge in Costa Rica. After a long day of swimming and having fun in the outdoor hot spring, following an instructor-led yoga class or simply lying lazily in your hammock   (吊床), it’s time to hit the beach. It's no big deal, since the beautiful blue waves of the Caribbean are just a short walk away.

The Tree House Resort — Chandwaji, India

The Tree House Resort is a fancy place to stay, located in the trees and full of tropical joy. Here, nature is peaceful except for quiet moments. From the windows at night, you can sec the Aravalli mountains and hear only the sounds of crickets   (蟋蟀).