Need for a spare tyre

For some time now I am holding the speed record in our neighbourhood. But recently some kids started to claim that there were indeed faster than me. To settle these rumours I challenged 3 kids, around 3-6 years old. Of course I had no mercy with them and defended my record (mainly by exploiding my knowledge about vehicle aerodynamics :)). Unfortunately in one of my last laps the tyre split got a crack. As soon as some others will challenge me I need some knew tyres. Also some parents seem not to like the ideas that 6 year old siblings take the cars or motorbikes of their 3 year old siblings, but I did not plan to be an example for these kids, I just couldn’t except the rumours in the neighborhood.

Things our hair is also useful for

I haven’t heard this before, so it might be of interest to others as well
http://www.allstar.fiu.edu/aero/Experiment15.htm