Bitcoin is only a tiny fraction of the black market. The black market is considered a subset of the informal economy, of which 1.8 billion people worldwide are employed. Market revenue is estimated to be 1829 billion $.  The bitcoin market cap has not reached such sizes.

You could write your private key on a piece of paper, this can last longer than ten years.  The private key is not that large so you do not need an entire disc to store it.
A private key is 256bits long and 256 really is not that large and you could even convert it to a shorter hexadecimal number of 64 characters. 

If he shows himself he will not be famous but poor. You cannot own thousands of BTC and simply walk the streets without anonymity.
Unless you are the owner of Mt Gx, Mark Karpales....  



21 million is an interesting choice. 21 is not a traditional computational number (2,4,8,16,32).
The 21 million actually derive from a few educated guesses:
- 10 minutes between blocks
- 50 BTC per block
- 4 years between block reward halving

The 4 years were rounded down to 210.000 blocks.

Keep in mind that "a Bitcoin" doesn't exist in any real sense in the code. Satoshi exists:  .00000001 BTC.

It could be profitable if the market is big enough. At the moment it may be a small market but you could increase that market by including related concepts such as cryptography and computer networks. An online 'virtual visit' for a number of bitcoins could be included to reach a larger market.

GnuPG is a hybrid encryption software program in that it uses a combination of conventional symmetric-key cryptography for speed, and public-key cryptography for ease of secure key exchange. You can use GPG to encrypt data.

Links are here:
https://gnupg.org/
http://aplawrence.com/Basics/gpg.html

Paypal has previously blocked accounts of (bitcoin) users. But, you could buy using an escrow service. The risk is losing your money and your bitcoins, even if an escort escrow is used. Localbitcoins or an exchange is more safe.

They cannot prove that they will not do that, which is why something like the Mt Gox theft was possible. At best an exchange could give you control over your bitcoins by handing you your private keys. Private keys are used to initiate bitcoin transactions and could be imported into your wallet.  Exchanges are no exception to this: any centralized system can run away with your money (including banking systems). If you do not have the private keys you do not control the money.

"Ebola free" should be read as no infected person has been registered. The virus is probably still in the area because it can survive in other mammals including apes and bats.
Another form of this virus has been found in 1976, the virus can survive for many many years in an area.

Is there a market for ebola?  

No, scarcity is an big influential factor for the bitcoin price index. Bitcoins are produced during the mining process.  The reward is 25 bitcoins per block (approximately every ten minutes) until mid 2016, and then afterwards 12.5 bitcoins per block for 4 years until next halving. This halving continues until 2110-2140 when 21 million bitcoins have been issued.
Other influential factors are investors and panic buyers/sellers.

Can entrance tickets be bought with bitcoin?
The coins look really good, are they still for sale?

Which features of altcoins will be incorporated? I am curious to find out.

Korea and Japan have a very large internet culture, I would have expected they are more ahead as well. This board does have a Korean and Japanese forum. The Korean board has 599 posts and the Japanese board only 91 posts.  Chinese board has 242671 posts. Is there any reason why it is more popular in China?

If your government decides to start a war tomorrow you have as much power as an ordinary citizen during world war 1. In a collective group you might achieve a temporary state of peace but even that is no guarantee.  The motivations for war are always the same: more authority/power, profits and resources. Think about that, if you are a dictator will you start a war to get less power, no profits and no resources?

This is a bot sending spam in the transaction message. Every transaction can have a message associated with it. They randomly send a few satoshis to a collection of addresses. Perhaps other blockchain explorers can hide these dust transactions.
See these threads for more info:
https://bitcointalk.org/index.php?topic=801364.0
https://bitcointalk.org/index.php?topic=474140.0
https://bitcointalk.org/index.php?topic=806173.0

Is there a list of reputable cloud mining providers? There are so many companies these days that offer cloud mining services.

This story is similar to Mt Gox unless he was kidnapped. If people are in control of your money they are tempted to take a run with it, be it exchanges or banks. To own a wallet is the only way to be in control of your money.  Why does the phrase contain "believe to be in the personal wallet" ? We do not need the word "believe", if we know the address we can simply look in the blockchain.

I like this proposition. Satoshi makes sense for small amounts, whereas it does not make sense for very large amounts . Bits is an interesting idea because it makes sense to get 'bits' when you buy bitcoin.

This is a simple getting started manual for newbies https://bitcoin.org/en/bitcoin-for-individuals
A very basic explanation of the system is https://bitcoin.org/en/how-it-works

Ebola virus infection occurs only by direct contact with the blood or body fluids of a person after symptoms have developed. Body fluids that could contain ebolaviruses include saliva, mucus, vomit, feces, sweat, tears, breast milk, urine, and semen. No other infection method has been found.  The virus can spread fast but it's unlikely to infect the entire world.  Risk of death is 50% but that depends on which type of Ebola virus (it's a group). About 5000 cases have been reported in 2014, and this may be a wrong estimate, while the population size of Liberia alone is 4.092.310.   I think the virus will spread more, possibly also on other continents and eventually it will disappear.  I do not think the entire populations of countries will die, which of course is a good news story to tell but perhaps far from reality.

Correct, you need a wallet address to send someone a payment.  Why do you require their BTC wallet address, is the goal not that they pay you?
If a person does not want to enter their address you could arrange a meeting with paper wallet payment.