No ideas but like yours.
Thanks
Your typical disposable lighter is great for lighting birthday candles or starting up a charcoal grill. Other than that they are pretty lame and go out with just the slightest breeze. We think that lighter could be put to much better use and we'll tell you how.
Being a 'how to' on all aspects of producing a fire in the eighteenth century manner by using flint and steel, by a gentleman who has done it successfully.
Any sort of magnifying lens may be used to start a fire on a sunny day.