In the 1980, there was a country which no longer exists called Lafrica. This country had a way of preventing STI's by using a rope with a hook attached on the end by inserting it into the affected...
So it sticks together. If you're from a culture that uses chopsticks, eating rice would be very hard if the grains were entirely seperate. It'd be a lot of hard work. So in these cultures, the rice...
Tape such as duct tape owes its stickiness to pressure sensitive adhesives (PSA). It is made from a solid polymer base that "blends" to a surface when pressure is applied.