Vastu is an inherent energy concept of science. We cannot see energy with our naked eyes but we can realize and see its application in different forms and fashions. Universe is one of the beautiful creations of nature and everything stands alive only in the limelight of truth. Just like every subject of human aspect is governed with rules, regulations & acts, similarly the nature has also got certain key factor principles for smooth governing of its residents, in which "Vastu stands for nature law" and ignorance of law is not an excuse anywhere.
Entrance of a house predicts many a things about the occupants in the house in terms of nature and especially health. Having kitchen right in the entrance is a major flaw in the house and in such cases focus on food is very intense.
Every living and non-living thing on this cosmos gives out energy effecting the lives in different ways. Science of architecture which is precisely called Vastu-Shastra gives away norms of placement for everything relative to this earth.
People may feel amaze by listening that a specific direction could be responsible for their erring behaviour! But this is true our behaviour changes with the directions we face during the day to day life.
Not every time it is possible that people who are sharp brained do fair all time in life. This is not necessary as most of the times you have the luck of your stars while intelligence is hardly a part in success.