[jmdocherty]

This a really interesting idea. The problem of stabbing/puncturing can be solved by moving the liquid lower in the ground and having a floating more robust layer above. I imagine it would be particularly useful in places like outside hospitals where ambulances would prefer a smooth ride if possible. However, I'm sure we used to make a liquid with similar properties when we were children out of cornflower (?) and water.

[DanBC]

> I'm sure we used to make a liquid with similar properties when we were children out of cornflower (?) and water.

lots of people call this oobleck, and there are a gajillion of youtube videos about it.

[maxerickson]

Cornstarch.

It is processed to isolate the starch.

[LeifCarrotson]

I'm sure they will make it pretty durable. A reasonable method of construction would be like a tire, with steel mesh under thick, tough rubber.

And it's corn starch, not corn flower, and water. About a 2:1 ratio.

[jfk13]

American "corn starch" = British "cornflour". E.g. see https://en.wikipedia.org/wiki/Corn_starch.

[mkl]

In many countries it's called "cornflour" or "corn flour".