What's the meaning of "Why Truvia makes flies drop like flies is still a mystery."?
1. Why Truvia makes flies drop like flies is still a mystery. Back in the lab, the researchers confirmed that the bugs weren’t starving: they all continued to eat. Most actually seemed to prefer Truvia to real sugar when offered a choice, findings published in the journal PLOS One.
What's the meaning of "Why Truvia makes flies drop like flies is still a mystery."?
2. Apple, Google and other tech companies have spent years gathering info about your purchasing habits, entertainment preferences and social circles. They want to know what makes you tick. Now they also want to know about your actual ticker. The tech firms are targeting your vital signs with health apps and online data repositories.
What does "tick" and "ticker" mean here?

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Drop like flies is an idiom that we use when a group rapidly collapses or dies.  So the Truvia was causing the actual flies to die out quickly and in larger numbers.  But, scientists don't know why.

In English, we say that a clock makes a ticking noise as the hands go around.

So what makes you tick is the thing that makes you happy or keeps you going.

When we talk about your ticker, we are talking about your heart. Also, a reference to the steady beat of the second hand on a clock.

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