I AM

Blood Group B+

Rhesus Anti-D

I took out my blood card today...

Maybe i want to be an O

Sigh..

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Nic told me a riddle a friend told him..

two strings burning at different burning rates
both aren't identical in length or burning rates.
the overall time to burn each string is 60 mins.
how do you use the string to gauge 45 mins.

I got it right, this is what techies do on their free time?
i dunno