My suggestion to Cindy's summaries

Cindy’s:
1st summary
http://literacynet.org/cnnsf/flydreams/home.html
According to this article, we know that the inventor tried to create a machine which can load one people to fly. It looks like a mini helicopter with two fans and 120 horsepower engines(engine). It is said that this machine would be sold next year on the market with(for) about a million dollars; however, it is still an unknown. Though NASA has signed on with the inventor to develop the machine (and) the innovation’s first usage would be on military.

Suggestion:
1. delete ”s”, it’s single.
2. sell +for+price
3. “the innovation’s first usage would be on military.”is not allowed to add directly after the previous clause. You’d better add a conj. Between them.

2nd summary
http://news.yahoo.com/s/nm/20071009/od_nm/heart_relationships_dc;_ylt=Agfq.ZWJLgtJ49nSEOQ7TUes0NUE
According to the news, the stress and anxiety of hostile and angry relationships can boost(increase) the risk of developing heart disease, and heart condition is obviously affected by the negative intimate relationships .If you have many positive relationships, it means “healthier life”, which can cut down the probability of heart disease. Therefore, the people you get along with are also factors of affecting(effecting) your health situation(condition); the good people are good to your health, and(while) the passive people are negative to your health.

Suggestion:
1. boost usually use in positive manner, not negative way. We can change that in to “increase”
2.affecting is a negative verb, in this situation, it’s better to use neutral verb.
3. Health condition is a common use.
4.The grammar here is ok, but it’ll be perfect if you use “while”