Asteroids and comets are really interesting to learn about. Here is some information on the most famous comet of all, Halley’s Comet: http://www.scientificamerican.com/gallery/is-seeing-a-comet-like-halley-s-a-once-in-a-lifetime-event/

You may or may not be using pay-per-click marketing (PPC) by way of Google AdWords, Microsoft AdCenter, or Yahoo Search Marketing. Did you know that what works excellent on one engine can (and will) lose money on another? Each PPC provider has a very specific audience (generally), and when it comes to an industry, or even a specific keyword, that specific audience can change completely.

AdWords provides a demographic bidding model for Google Content Network ad placements. While this particular strategy is not profitable for everyone, it can hold extremely high click-through rates and conversion rates for the right advertiser.

You can refine your reach based on users’ gender and age on certain sites in the Google content network such as MySpace and Friendster, whose users provide that information about themselves.

Think about that for just a second. Instead of throwing out valuable impressions and potential clicks to just anyone, you can show to only those users who meet your target audience. How much better would your conversion rate be if you excluded those who were very unlikely to purchase from you?

Sometimes, it’s not about reaching more people. It’s about reaching the better ones.