parkr

// go to https://twitter.com/your-username, and enter the following into the developer console:
for(var i = 1; i < 500; i++){ // just do it a bunch
  // Un retweet
  document.getElementsByClassName("ProfileTweet-actionButtonUndo")[i].click();
  document.getElementsByClassName("js-close")[0].click();
  // Delete tweets
  document.getElementsByClassName("js-actionDelete")[i].childNodes[1].click();
  document.getElementsByClassName("delete-action")[0].click()
}

TejasSheth104

For the microscope images, we can use a binary matrix where each pixel 
corresponds to either black or white.

For the dye sensor images, we can use a sparse representation. 
We’ll only store the coordinates (x, y) where the dye is detected, instead of storing the entire image.
We can use a list of tuples or a dictionary

Microscope image: 100,000 x 100,000 bits
Dye sensor image (sparse representation): Depends on the number of dye-detected pixels.