Step 400 of the acorn methuselah. Gliders exit at 12:30 and 5:00.| Do the Math
Nothing lasts forever.| Do the Math
Image by naturfreund_pics from Pixabay| Do the Math
Image by günter from Pixabay| Do the Math
What success might look like? Image by Emma Farley from Pixabay.| Do the Math
This is the TV poster for “David Attenborough: A Life on Our Planet.” (CNS photo/Netflix)| Do the Math
From Pixabay/Activedia| Do the Math
From Pixabay (Kranic17/535 images)| Do the Math
As we look toward the uncertain future, it may occur to some among us that we’ll need energy on Mars. How are we going to get it? Presumably Mars has no fossil fuels—although on the plus side its atmosphere is already 95% CO2, compared to Earth’s 0.04%, so they’re likely to be less uptight about carbon emissions on the red planet.| Do the Math