Popular science: how can IKEA make you want to buy more and more?

I don't know if you've ever felt that every time you walk into Ikea, you can't help but look around and touch things. This kind of behavior is called "impulse shopping" in psychology, which means that when people see the advantages of something, they forget about their own needs and make an order without thinking about it. Ikea, on the other hand, is a master at exploiting this psychology.

In this video, Vox asked the creative director of IKEA to explain the concept of IKEA's layout design. According to him, only about 20% of the purchases made in IKEA stores are pre-planned by customers, while the other 80% are impulse purchases.

After all, all the aisle layouts, merchandising, shelf placement, and even the restaurant at the exit are all little bits of IKEA design to get you to buy more stuff.

Popular Science: The disadvantages of sedentary for the body

The skeletal structure of modern humans was not designed to remain seated, which leads to a variety of injuries when we sit in chairs for long periods of time.

Prolonged sitting not only puts extra pressure on the spine and lumbar discs, but it also blocks nerves in the legs and protein transmission that break down fat. Prolonged bending of the muscles also blocks the transmission of nerves and proteins that break down fat in the legs, leading to numbness and fat accumulation in the legs. Also, involuntary leaning forward can compress the lungs, reduce oxygen intake to the brain, and prevent you from thinking.

In this short animated video, Ted vividly demonstrates the stress that sitting posture places on different parts of the body. After watching the video, grab your body and stretch backward, or simply stand up and walk around to relax your body!

Why a week have 7 days?

"A year is a time it takes the Earth to go around the sun, a month is a time it takes the moon to change phase by one cycle, a day is the cycle of the Earth's rotation - so the question is, what exactly is a week?

Unlike the aforementioned units of time, the concept of the "week" seems to come entirely from the human creation. How is it defined? Why has the world adopted the "7 days equals 1-week" rule?

How did the words "Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday" get invented?

--Youtuber: It's Okay To Be Smart is explained very clearly in the first half of the video.

There are seven "stars" that the ancient people could see with the naked eye - the Moon, Mercury, Venus, Mars, Jupiter, Saturn, and the Sun. The ancient Greeks used the number "7" for each of the "gods," while the ancient Babylonians used the number "7" for the heavens. As religions and civilizations spread and evolved, the concept of the week, and the names of the days, took shape.

This guy's explanation from 7:30 onwards is a bit confusing. In a nutshell, the general idea is - there is no definitive evidence that anyone or anything has established the consensus that the week is a 7-day week. But we can now find a lot of significance for the number "7" in the history and culture of various countries.