Grunsfeld added that the brine streaks aren't the most likely place on Mars to find life - better conditions for microbes would likely be underground, near a source of fresh water, rather than salty water.
An Australia ETA (Electronic Travel Authority) is a visa for travel to Australia that is issued electronically. An Australia ETA is typically valid for one year, and allows for multiple visits to Australia for a stay of up to 90 days per visit for tourist or for business travelers.
Pricing of competitors. The other factor that likely played into the decision for a 2.75% processing fee was the pricing issued by competitors. Square's initial processing fee actually was the 2.75% fee, plus a $0.15 transaction fee. This was pretty standard, as Intuit's GoPayment which launched prior to Square had a similar fee structure, offering the credit card reader for free and combining a percentage processing fee with a fixed transactional fee.