Assorted links

1. Zerocoin, a new Bitcoin competitor with anonymity.

2. Are immigrants really so anti-libertarian?

3. What do liberals get wrong about single payer?

4. The custom of the public deathbed.

5. William Chislett on where Spain stands now.

6. What scientific idea is ready for retirement?  (Hint: most of the criticisms are wrong, even the attack on the law of excluded middle from Alan Alda.)