It is sometimes called the "Bolognese tear".
This is a teardrop-shaped, almost indestructible piece of glass.
The name "Rupert's Drop" is derived from Prince Rupert of the Rhine, who brought it to England in 1660. Such a piece of glass also survives a rifle bullet.
To destroy the thing, all you have to do is break off the thin end from behind, then it will disintegrate into fine glass dust. It looks something like this:
The drops led to the invention of the shatterproof glass we know today.
2 - a giant bar magnet on a series of compasses
You can clearly see the magnetic field lines that run from the North Pole to the South Pole.
3 - the optical 5X dual zoom
This is an optical zoom - not a digital zoom.
The digital zoom is pathetic in comparison.
With this technology, which uses the way periscopes work, the zoom of a camera becomes much better. And it also eliminates the "camera bump" that we often see on smartphones.
This technology was presented at the Mobile World Congress in 2017.
4 - The SpaceX Falcon 9 Landing
Why waste fuel tanks in the sea?
SpaceX has technology that allows it to land its first-stage boosters back on Earth. This has drastically reduced the cost of space missions.
5 - An "unfurnished" giant Boeing 787 aircraft.