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The recommended number of steps per day has been determined

08.08.2023

Studies conducted by scientists show that over the past hundred years, humanity has significantly reduced the number of daily steps - by 96%. It is necessary to realize that the complete cessation of motor activity can lead to the threat of extinction of the human species. But there was an alternative, and this is not the famous ten thousand steps.

It turns out that this number became the standard by mistake when, in 1964, a Japanese company launched a crocometer on the market, which translates as "10 step counter." This novelty impressed customers so much that they quickly accepted this value and began to strive for it without much motive.

In fact, the optimal number of steps per day for each person depends on many factors, including overall health, level of physical activity during the day, and even eating style. Harvard University professor Yiming Lee conducted a study on this topic together with colleagues. About 16 American women over 70 took part in the study. Each of them was given a wrist device for counting steps, after which the experiment was launched.

The results showed that, on average, the participants walked about 5500 steps a day. However, those who walked 7500 steps or less were more likely to live longer than those who limited themselves to 4500 steps. The positive effects of physical activity persisted up to the 7500 step mark, and walking above this threshold did not have a significant positive effect on life expectancy.

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CalBattery has developed an electrode that increases the capacity of lithium-ion batteries by 3 times while reducing their cost by 70%.

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Eight months of work by specialists from CalBattery and Argonne National Laboratory show that the new battery has a good chance of becoming a new generation of batteries and conquering the commercial market. Unlike most commercial lithium-ion batteries, the new battery has an energy density of 525 Wh/kg and a specific electrode capacity of 1250 mAh/g. At the same time, modern lithium-ion batteries have corresponding indicators of 100-180 W * h / kg and 325 mAh / g.

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The key to the future of the battery was the discovery of a process that stabilizes the silicon in the anode of a lithium battery. Although silicon absorbs lithium ten times better than any other material, it degrades quickly during charge/discharge cycles. The scientists experimented with several materials for the electrode and electrolyte. As a result, it was possible to create a composite electrode based on graphene and silicon, which is significantly superior to all existing commercial technologies. The developers believe that a new type of electrode can replace conventional graphite electrodes in 2-3 years and significantly increase the duration of operation of numerous devices that are powered by batteries.

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