- What is a tardis?

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When the time is between 5 and 6 o'clock, what is the exact time at which the minute hand is directly over the hour hand? How to extract indigo from plants? Whats the possibility that humans could go extinct in our lifetimes? What is the pH of 1m lactic acid and how to calculate that? Solve using the Substitution method for x+y=4 and 5x-3y=12 (PLEASE SHOW STEPS)?