Some molecules - ammonia, ...

Some molecules - ammonia, carbon dioxide, water - show up everywhere in the universe, whether life is present or not. But others pop up especially in the presence of life itself. Among the biomarkers in Earth\'s atmosphere are ozone-destroying chlorofluorocarbons from aerosol sprays, vapor from mineral solvents, escaped coolants from refrigerators and air conditioners, and smog from the burning of fossil fuels. No other way to read that list: sure signs of the absence of intelligence.
Some molecules - ammonia, carbon dioxide, water - show up everywhere in the universe, whether life is present or not. But others pop up especially in the presence of life itself. Among the biomarkers in Earth's atmosphere are ozone-destroying chlorofluorocarbons from aerosol sprays, vapor from mineral solvents, escaped coolants from refrigerators and air conditioners, and smog from the burning of fossil fuels. No other way to read that list: sure signs of the absence of intelligence.
 Neil deGrasse Tyson

Quotes from the same author

I have a multivolume history of the world from the 19th century that begins with Noah's flood as though it's as historical a fact as the rise and fall of Rome.
 See image
 Neil deGrasse Tyson
I would teach how science works as much as I would teach what science knows. I would assert (given that essentially, everyone will learn to read) that science literacy is the most important kind of literacy they can take into the 21st century. I would undervalue grades based on knowing things and find ways to reward curiosity. In the end, it's the people who are curious who change the world.
 See image
 Neil deGrasse Tyson
In this 21st century, bedtime doesn't matter at all. All that matters is what you set for your DVR [Digital Video Recorder].
 See image
 Neil deGrasse Tyson
So many people have that kind of attitude and approach to learning that it gives me great hope for the world. I say hope in the sense that innovations in science and technology will be the engines of a 21st century economy and I don't want to go broke, as a nation. So, the hope I have is that, if people embrace it, we'll have a healthier, more secure, wealthier nation than we have.
 See image
 Neil deGrasse Tyson
The whole society has to recognize the importance of the value in embracing what science is going into the 21st Century. Otherwise, we might as well start packing and moving back into the cave right now, because that's where we'll end up.
 See image
 Neil deGrasse Tyson