How to hold a cup helps coffee not to spill out

According to scientists, the best way to help coffee does not fall out is to hold it at the top around the cup mouth like the image below.

Holding the cup as shown will avoid spilling the water out during a collision.

The wrist acts like a pendulum, blocking the impact on the cup.

Many physicists are always trying to find a solution to the problem of coffee pouring, because for them, the effect of caffeine is important when they have to stay awake for their research. Although the same is liquid, the wine is not poured out as much as coffee, which is also hard to explain.

Another solution is to recoil when holding a cup of coffee, but actually this way makes coffee spill out more. The americano cup is covered with a layer of cream is also a measure but for those who like to drink cappuccinos it probably isn't a reasonable way.