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<h1 class="text-center">Isaac Newton</h1>
  <h2 class="text-center">english physicits and mathematician and a key figure in the scientific revolution</h2>
  <img src="http://img15.deviantart.net/c4a7/i/2015/106/f/1/isaac_newton_by_sinwall-d7q5pc7.jpg" alt="isaac newton photo"  >
  <p> sir Isaac Newton was an english <a href="https://en.wikipedia.org/wiki/Physicist"> physicits </a> and <a href="https://en.wikipedia.org/wiki/Mathematician"> mathematician </a> who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolution.</p>
  <p >Newton's Principia formulated the laws of motion and universal gravitation, which dominated scientists' view of the physical universe for the next three centuries ,and also demonstrated that the<a href="https://en.wikipedia.org/wiki/Dynamics_(mechanics)"> motion of objects </a> on Earth and of <a href="https://en.wikipedia.org/wiki/Celestial_mechanics" >celestial </a> bodies could be described by the same principles</p>

<h2 class="text-center" >Here's a time line of sir Isaac Newton:</h2>
<ul >
  <li><strong> 25<sup>th</sup>Dec.1642</strong> : Birth of Isaac Newton in Woolsthorpe, England </li>
  <li><strong> 1654</strong>: Newton enrolls in the Grantham Grammar School </li>
  <li> <strong>1661</strong>: Newton enrolls in Trinity College, Cambridge. </li>
  <li> <strong>1665</strong>: Newton receives his bachelor of arts from Trinity College</li>
  <li> <strong>1666</strong>: Fire in London. Outbreak of plague drives Newton to retire to his mother's home in Woolsthorpe. Newton conducts prism experiments, discovers spectrum of light; works out his system of "fluxions," precursor of modern calculus; begins to consider the idea of gravity.</li>
  <li> <strong>11<sup>th</sup> Jan. 1672</strong>: Newton elected to the Royal Society </li>
  <li><strong>1670<sub>s</sub></strong>: Newton works on the mathematics of gravitation in his home in Cambridge.</li>
  <li> <strong>1684</strong>:Halley goes to visit Newton in Cambridge, where they discuss the principle inverse squares and its relationship with planetary orbits.</li>
  <li><strong>1684</strong>: Newton completes his calculations on gravity and shares them with Halley, who urges him to publish. </li>
  <li><strong>1686</strong>:Newton presents the first book of the Principia to the Royal Society.</li>
  <li><strong>1689</strong>: Newton elected as Cambridge's representative to Parliament.</li>
  <li><strong>1699</strong>: Newton named master of the Mint. 
  <li><strong>1713</strong>: Second edition of the Principia published. </li>
  <li><strong>1726</strong>: Third edition of the Principia published; all reference to Leibniz has been removed. </li>
  <li><strong>20<sup>th</sup>Mar. 1727</strong>: Death of Sir Isaac Newton, in London. </li>
<p >If you have time, you should read more about this incredible human being on his 
  <a href="https://en.wikipedia.org/wiki/Isaac_Newton"> 
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