A magnet

A magnet

Velcro

A wooden Stick?

A magnet

interesting. question. It doesn't say what it sticks to, or how it sticks, which opens the door to a few options:- A magnet sticks to many metallic surfaces - it does NOT stick to pure gold. Velcro sticks, but is not sticky.- just try getting it off a hairy wool jumper. Of course geckos stick well to walls (didn't rule out living options!) AND then there are the chemical stickies. Water is considered to be a sticky liquid the strong polar bonds between water molecules create a electostatic force that packs the water molecules closely together and adheres the molecules to each other - it is considered to be VERY cohesive. With four hydrogen bonds (tetrahedral bond) it is considered to be the greatest cohesive liquid. You really need to limit this question!

Mary_Again said:

Spoiler

interesting. question. It doesn't say what it sticks to, or how it sticks, which opens the door to a few options:- A magnet sticks to many metallic surfaces - it does NOT stick to pure gold. Velcro sticks, but is not sticky.- just try getting it off a hairy wool jumper. Of course geckos stick well to walls (didn't rule out living options!) AND then there are the chemical stickies. Water is considered to be a sticky liquid the strong polar bonds between water molecules create a electostatic force that packs the water molecules closely together and adheres the molecules to each other - it is considered to be VERY cohesive. With four hydrogen bonds (tetrahedral bond) it is considered to be the greatest cohesive liquid. You really need to limit this question!

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Don’t be silly it’s fun reading all the different answers people come up with, so just enjoy these posts.

A stick

Velcro

Amagnet

Mate.

A magnet

Although I know the answer is probably a Magnet, I'd like to say your SHADOW.

A magnet.

A magnet

A magnet

Velcro

Suction cup

A magnet.

Principles