One Hundred Interesting Mathematical Calculations, Number 7: Archive Entry From Brad DeLong's Webjournal One Hundred Interesting Mathematical Calculations, Number 7 One Hundred Interesting Mathematical Calculations, Number 7: Julius Caesar's Last Breath What's the chance that the breath you just inhaled contains at least one air molecule that was in Julius Caesar's last breath--the one in which he said (according to Shakespeare) " Et tu Brute ? Then die Caesar"? Assume that the more than two thousand years that have passed have been enough time for all the molecules in Caesar's last breath to mix evenly in the atmosphere, and that only a trivial amount of the molecules have leaked out into the oceans or the ground. Assume further that there are about 10 44 molecules of air, and about 2 x 10 22 molecules in each breath--yours or Caesar's. That gives a chance of 2 x 10 22 /10 44 = 2x 10 -22 that any one particular molecule you breathe in came from Caesar's last breath. [1-2x10 -22 ] [2x10^22] How to evaluate this? [e [-2x10^(-22)] ] [2x10^(22)] From John Allen Paulos's Innumeracy .
Periodic Table of Elements [Interactive] Hydrogen Fun Fact: Despite all the nuclear fusion that has occurred in stars since the big bang, hydrogen is still by far the most abundant element in the universe, and makes up four-fifths of all ordinary matter. For a while it was touted as the fuel of the future, but it remains difficult to produce, transport and store. At extreme temperatures and pressures, like those at the core of a gas-giant planet, hydrogen can become metallic. He Helium Fun Fact: It is not the lightest of all elements, but it is the smallest: it has a stronger electrostatic charge in its nucleus than hydrogen does, and thus it keeps its electrons in a tighter orbit. Li Lithium Fun Fact: One of only three elements to be created in the big bang, though in much smaller amounts than hydrogen or helium. Be Beryllium Fun Fact: This element is the first one that requires more neutrons than protons in its nucleus in order to be stable, and thus it created a bottleneck in the formation of new elements after the big bang. Boron
Exotic Melons What is the full chemical name for titin Titin, also known as connectin, (UniProt name: Q10466_HUMAN; accession number: Q10466) is a protein that is important in the contraction of striated muscle tissues. Titin connects the Z line to the M line in the sarcomere. The protein limits the range of motion of the sarcomere in tension, thus contributing to the passive stiffness of muscle. Variations in the sequence of titin between different types of muscle (e.g. cardiac or skeletal) has been correlated with differences in the mechanical properties of the muscles.[1] Titin is the largest known protein, consisting of 26,926 amino acids. The molecular weight of the mature protein is approximately 2,993,451.39 Da, and it has a theoretical pI of 6.35 [1]. As the largest known protein, titin has the longest full chemical name. Titin (UniProt name: Q10466_HUMAN; accession number: Q10466) is a protein that is important in the contraction of striated muscle tissues.
77 Brain Hacks to Learn Faster, Deeper, and Better Source: Online Education Database If someone granted you one wish, what do you imagine you would want out of life that you haven't gotten yet? For many people, it would be self-improvement and knowledge. New knowledge is the backbone of society's progress. Great thinkers such as Leonardo da Vinci, Thomas Edison, Benjamin Franklin, Albert Einstein, and others' quests for knowledge have led society to many of the marvels we enjoy today. Your quest for knowledge doesn't have to be as Earth-changing as Einstein's, but it can be an important part of your life, leading to a new job, better pay, a new hobby, or simply knowledge for knowledge's sake — whatever is important to you as an end goal. Life-changing knowledge does typically require advanced learning techniques. Here are 77 tips related to knowledge and learning to help you on your quest. 1. 2. 4. 5. Balance 6. 7. 8. 9. 10. 11. 12. 13. 14. Recall Techniques 15. 16. 17. Visual Aids 18. 19. 20. 21. 22. Verbal and Auditory Techniques 24. 25.
infoverse - octomatics Watch the outtakes at the end! Canoë - Techno-Sciences - Des vêtements intelligents pour détecter les maladies Des chercheurs Américains et en Chinois viennent de faire de sérieux progrès vers la production relativement simple et peu coûteuse de «tissus intelligents», des textiles électroniques capables de détecter les maladies, surveiller le rythme cardiaque ainsi que d'autres signes vitaux. Les résultats de cette recherche digne d’un roman de science-fiction publié dans le magazine scientifique ACS' Nano Letters de décembre. Dans cette étonnante étude, Nicholas A. Kotov de l’Université du Michigan et Chuanlai Xu de l’Université Jiangnan, soulignent que les textiles électroniques, ou «e-textiles», sont déjà une réalité. Toutefois, ceux qui existent actuellement sont volumineux, rigides et complexes si bien qu’ils ne sont pas du tout pratiques. Les fibres mises au point par les chercheurs sont en coton enduit d'électrolytes et de nanotubes de carbone (CNT).