Tableau 201: How to Make a What-If Analysis Using Parameters. 17. Tableau 201: How to Make a What-If Analysis Using Parameters. Parameters are one of the most powerful tools available in Tableau for exploring your data and providing interactivity to your end users. The best way to think of parameters is that they act as wildcards.
The United States has invested almost $78 billion in the International Space Station (ISS or Station) over the last 21 years, and going forward, NASA plans to spend between $3 and $4 billion annually to maintain and operate the Station, including transportation for crew and cargo.1 In a May 2014 report,
Life on the International Space Station reveals some of the massive challenges we would face. Simply ferrying enough water for its six inhabitants costs around $2 billion per year. Thatâs not to mention the difficulties of providing food and oxygen.Ideally, a space colony would need to become self-sufficient, generating all these resources itself or perhaps mining them from nearby asteroids.hen there are the stresses to the human body: reduced gravity can lead to bone and muscle loss and a dangerous build-up of pressure in the head, which can sometimes lead to temporary and persistent eye problems. Cosmic radiation, meanwhile, can cause cataracts and increase the risk of cancer.