Sharing some random tidbits I learned throughout the week.

  • The giant tanks on Hoth in The Empire Strikes back are called AT-AT Walkers (All Terrain Armored Transport).
  • pry is an awesome IRB alternative that can be used for debugging. My favourite part is that you can cd into objects use and ls to see its methods.
  • HTTP Cookie is a small piece of data stored in a user’s browser and sent along with subsequent requests to the server to notify the server of previous activity.
    • 4kb size limit for key value pairs
    • Each request sends all cookies
    • For user session information, Rails stores a special session cookie containing entire session hash.
      • Storing stuff in the cookies hash gets stored in individual cookies.
  • When you buy insurance, you transfer the potential loss costs to the insurance company in exchange for a fee known as the premium.
    • Insurance companies then invest the funds so it can pay out claims.
    • The higher the risk, the higher the premium.
    • Idemnity is the protection against a financial loss.
  • The SEC or Securities and Exchange Commission is a government agency to enforce securities laws.
  • SEC Filings are reports on a company’s history, progress and future.
  • The Annual Report is an annual publication that public corporations must provide to shareholders to describe operations and financial conditions.
  • The FY or Fiscal Year is used in accounting to denote the beginning and end of one year of business activity.
  • The 10-K is a yearly comprehensive summary report of a company’s report containing much more detail than the annual report.
    • 10-Q report is submitted quarterly. (35 days after each of the first 3 fiscal quarters)
  • The Black-Scholes model is used to calculate the theoretical price of stock options.
    • Takes into account, current price, strike price, expiration time, volatility, interest rates
    • Cox-Rubenstein Binomial Option Pricing Model is a variation that looks at the security over a period of time rather than just at one point in time.
  • A naked position is a trading position where the seller is not protected against adverse price movements.
    • To cover a naked position, you can buy put options.