scientific and technological invention

scientific and technological invention Free Videos
Various magnet combination pen, can write, can draw a circle, a multi-functional brush
Life
7.2
00:51
Various magnet combination pen, can write, can draw a circle, a multi-functional brush
When foreigners invent triangle tire bicycles, the principle is exquisite and they are too happy to ride.
Life
7.2
01:28
When foreigners invent triangle tire bicycles, the principle is exquisite and they are too happy to ride.
The shining zebra crossing is said to have saved countless lives!
Life
7.2
00:53
The shining zebra crossing is said to have saved countless lives!
What happens when a rocket ejector is installed in a driver's car?
Life
7.2
01:30
What happens when a rocket ejector is installed in a driver's car?
Unsatisfied with the compatibility of mountain bikes, it has to be transformed into a spring-driven bicycle.
Life
7.2
02:15
Unsatisfied with the compatibility of mountain bikes, it has to be transformed into a spring-driven bicycle.
What do you cut bread with? Kitchen knife? Take a look at this novel kitchen knife made with a saw
Life
7.2
01:18
What do you cut bread with? Kitchen knife? Take a look at this novel kitchen knife made with a saw