Riddle me this

53 bicycles and a smoking gun lay on a table. What happened?


Traditionally it's meant to be solved by answering yes or no questions, but you guys could probably get it without hints.

cheating at poker

If you have a four input resistor ladder digital to analog converter with a reference voltage of -5 volts, what is the contribution of each signal to the output voltage? What would be the best way to isolate a load on the output voltage while also normalizing the output range to between 0 and 15 volts?
 
I sing with no tongue,

I dance with no feet,

I beat with no heart,

What am I?
 
OTEScape, AFAIK it's 'the', and there's an XKCD comic that sums up riddles like that perfectly
 
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