We know that when it gets very hot outside or inside, people tend to eat less.
We know that when we release it, people will want to play it.
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We know that when it comes to education, particularly in the K through 12 context, that state dollars are very important.
We know that when employee productivity, customer satisfaction or employee engagement declines, it costs our companies billions of dollars in lost opportunities.
But over the long term, we know that when prices become very high, that's very much what we would expect in the long term.
We know that when the police re-opened the Lawrence files and started afresh in 2006, there were almost 200 potential suspects on the database.
Because we know that when our schools win, our kids win.
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Of course, we know that when it comes to athletes who have inspired America, any list would include the man known simply as The Greatest.
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Still, we know that when the rain and the storm are over, those that have prudently guided their clients through the storm will emerge stronger and poised for growth.
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And we know that when we need you most, you'll be ready to dash into danger, to protect our lives, even if it means putting your lives on the line.
And we know that when you embrace an inclusive vision of entrepreneurship, one that draws entrepreneurs of all demographics, backgrounds and locations, not only do the businesses they start succeed, America succeeds.
If you develop a postpartum depression, treat it quickly, because we know that when new moms get depressed, their babies suffer now and are much more likely to develop mental illness as they age.
We know that when his or her race, gender and other personal characteristics are detailed, those who see themselves as similar are far more likely to feel a sense of permission to follow suit.
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"We know that when it comes to capturing and sharing life experiences, people don't necessarily distinguish between photos and videos and in fact, often use one device to capture both, " said Oren Boiman , CEO of Magisto.
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We know that when girls have access to education and health care, are safe from violence, and have equal opportunities to reach their full potential, families and communities are more likely to thrive and countries are more likely to prosper.
We know that when a woman can plan the size of her family, she is healthier, more likely to finish her education, join the labor force, become more economically productive and engage in politics, thus more effectively shaping the future of her family and her country.
And the potential that I see in not just all of you, but all of our young women all across this world, that reminds me that the rest of us must work to lift up the women and girls in our own communities -- because we know that when women and girls rise, their communities and their countries rise with them.
Because we know that when we hit those roadblocks, if we keep showing up -- how many times have you heard somebody in your life just -- half of it is just showing up -- and you keep fighting the good fight, if we keep doing what we know in our hearts is the right thing to do, then know that eventually we get there.
"We all know that when we connect to the Internet, we spend more time for surfing and reading e-mail only, so when we are spending time we spend a lot of money to pay the accounts for only using a couple of hours, " Onel de Guzman's proposal read.
We know that, when under pressure by police to name someone as the guilty party, a witness will do so.
We know that historically when a large producer has turned to world markets those markets have become vulnerable to violent upward spikes.
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One thing we know is that when races look to be too close to call, it will all come down to voter turnout.
We now know that when plastic heats up, chemicals leach into the milk and are released into the body when the milk is consumed.
But what we also know is that when we decide to make a difference, when Americans come together, determined to bring about change, nobody can stop us.
We also know that when governments invest simultaneously in voluntary family planning, public health and education, countries can benefit from the "demographic dividend" seen in the Asian Tiger countries.
We do know that when smallpox has been introduced into populations who have not encountered the virus before, such as what happened during the colonization of the U.S., that smallpox had a much higher fatality rate, certainly exceeding 50 percent.
We all know anecdotally that when our friends share things, we pay attention.
"And so it just goes through simple common-sense things that we all know we need to do that sometimes, when mothers and dads aren't around to remind them, this will help remind them, " she said.
And also, something that we all know in times like this is that when we face a crisis as a country, we always come together as one American family.
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