$ {\bf E} \times {\bf B}$  (which is the Poynting vector multiplied by $\mu_0$) should be in the direction of wave motion.

I you want an aide-memoire, if you imagine taking a screwdriver and turning a (standard) screw in the direction of ${\bf E}$ towards ${\bf B}$, then the wave should be travelling in the direction that the screw is driven (either in or out).

How to determine directions of vectors of an electromagnetic wave
I have the option to buy a car that has been in an accident. There are alternatives, but within my budget the alternatives are usually older/have higher mileage. The seller is a local mechanic who did the restoration work and also showed pictures of the car before restoration. The damage was done to one of the front headlights and to the surrounding bits. The mechanic has convinced me that no damage was done to the internal carrying structure. He fixed the lights and did some paintwork restoration.

Problem: I read that people advice not to buy cars after the accident. This is my first car, so my experience is nonexistent.

Question: What are the cons against buying a car after the accident?

About the car: Opel Astra 2007 1.4 Petrol Manual Hatchback priced £2200, 1 prev owner, chain, 66K miles, 1 year MOT, 6 month tax
