For instance, I have successfully kept dart frogs together — even with multiple males — by providing a large number of hide spaces in a fairly massive tank. (petbusiness.com)
There's such a sense of advancement, from Russian forces starting the war using horses and medieval clubs to the end where the biggest aeroplane battles took place, where there were massive tank charges and naval battles — it lends itself perfectly to Battlefield. (theguardian.com)
The trick is to have all those mirrors heat up a massive tank fullof sodium and potassium nitrates that are pumped up to the top of the tower. (scientificamerican.com)