Analysis of air bubbles trapped in fossils, such as in fossil amber, show that our air in earliest times contained about 35% oxygen. Today, the average oxygen content of our air is approximately 20%. In some larger, more polluted cities, oxygen content in the air has been measured at 12 - 15%.
There are 297 words which start with 'pen'. 3 letter words starting with 'pen': pen. 4 letter words starting with 'pen': pend. pens.
lollipop is the longest word typed only with your right hand, if your right hand stays on the right side of the keyboard. 4. Dreamt is the only English word that ends with the letters MT. 6. The words racecar, kayak, and level are the same when read from left to right or from right to left. They are called palindromes. 8. There are two words in the English language that have all five vowels in order: abstemious and facetious.. Typewriter is the longest English word that can be made using letters from only one row of the keyboard.