I got a TK-85 back in Brazil around 1984. It had 16Kb of ram and it was a Sinclair ZX-81 clone. I was 8 and my grandpa said to my father that computers would be the future, he was right. I think we paid something around $100 in a department store. My father installed it on a TV, he tried to type his name, then gave the manual to me and started to hate the amount of time I spent with that computer :-D It worked with cassette tapes... a nightmare to load games like donkey kong. I learned Basic on that little thing. After that I got a TK-90 a Sinclair ZX-Spectrum with 48Kb of ram with sound and colors!!! Never stopped since then... a TK2000 (bad Apple II clone) and more clones like Exato CCE (another Apple II clone), a TK3000 (Apple IIe clone) until the early 90's when PCs started to get really popular. MSX computers were a big hit in Brazil, but they were very expensive at the time. From TK3000 I jumped to a PC clone (AT 286). Fun time when we could name our computers and know their models :-D

Not exactly. Long time ago, most Brazilians can't afford having a bank account! So Boletos were developed to allow people without a bank account to pay people with a bank account. So, with a Boleto, you can go to the post office and pay cash your bills. You can also ask somebody else to pay your bills, like an office clerk who will go to a bank or post office with the Boleto and pay with a check or cash. Some banks even accept credit/debit cards now. You can pay a boleto even in banks you don't have an account. A bank will collect Boletos for other banks and they manage the transaction doesn't matter if you are their client or if the seller is their client. Once it is paid, the seller is notified very fast and it works nationwide (it is ok to pay from one state to another, as they use the same national system). In Brazil you can pay with boletos at home, using internet banking. Some friends even have bar code readers to make it easier to pay their bills. You just scan the bar code and confirm the payment using your banking software. Nowadays, it is also used on e-commerce sites, because the buyer does not share any payment information with the seller. So a boleto is more like an invoice with full payment information, including date, fees (like 2% for the first day after due date and 1% per day after). It is also a confirmation of payment, as you receive a bank authentication code, printed on the back of the boleto (just after you pay or an electronic code if you pay by internet banking). This also says the date and the amount you paid. The seller uses a customer and order code to track who paid what and it works quite well. I live in Europe now and I miss the bar code. Here I have to type all sellers data like their name, address, bank account and amount to pay! No bar code :-(

How that would impact life on Earth? I mean, the mass of Earth is almost constant (no huge variations)... but what would happen to our orbit if we start to bring massive amounts of minerals and other stuff from the Moon? As the orbit is related to mass... changing the mass of Earth and Moon would change something, no?