Sep 23, 2010 If you like to use Cygwin and Mercurial together, like I do, it might be handy to know how to get your Mercurial commands from inside Cygwin to use PuTTY’s Pageant as its agent for SSH keys. It’s pretty simple, using PuTTY’s Plink. Plink is the PuTTY tool designed for non-interactive ssh usage.
Just add an ssh entry to the [ui] section of your .hgrc file:
[ui] ssh = "C:/Program Files/PuTTY/plink.exe"
Sep 1, 2010 The blood types we usually talk about are determined by the presence or absence of three antigens (A, B, and Rh-D). Here’s a table, where presence of an antigen is denoted by a 1 (true) and absence, by a 0 (false).
| A | B | Rh-D | Type |
| 0 | 0 | 0 | O- |
| 0 | 0 | 1 | O+ |
| 0 | 1 | 0 | B- |
| 0 | 1 | 1 | B+ |
| 1 | 0 | 0 | A- |
| 1 | 0 | 1 | A+ |
| 1 | 1 | 0 | AB- |
| 1 | 1 | 1 | AB+ |
You will reject a blood donation if it contains an antigen that your own blood does not. This is why O- is the “universal donor” (none of those antigens to reject) and AB+ is the “universal recipient” (you have them all naturally, so nothing is rejected). Let’s make a truth table for this, just for the A antigen:
| Donor A | Recipient A | Can accept |
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
Does that look familiar? It should; it’s the logical implication operation. So a person can receive another’s blood if the donor’s blood type bitwise implies the recipient’s blood type. Neat.
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