Trends are the cornerstone of contemporary fashion, and legal copying allows them to develop and spread.

WSJ: In Praise of the Copycats: The Knockoff Economy

And he had the charisma to develop and spread the message to Apple followers, creating efficient and effective WOM and buzz campaigns.

FORBES: One Question Behind Apple's Volatility

The Toyota-owned youth brand takes pains to develop and spread relevant free content based on Facebook.

FORBES: Does GM Have a Point About Facebook? Yes, Rivals Concede

Because it is mainly businesses that develop and spread new technologies, businesses also tend to face the first questions about how to use them.

ECONOMIST: Doing well by doing good

Cancer cells can differ hugely within a tumour - it helps them develop ways to resist drugs and spread round the body.

BBC: Thriving cancer's 'chaos' explained

For the past seven years, a drumbeat of publicity and warnings were issued over the virtues of the human papillomavirus, or HPV, and how to thwart its spread before countless women develop cervical cancer.

FORBES: Merck & Its HPV Vaccine: Sales & Skepticism Are Both Up

Those infected do not develop symptoms for up to 20 years and spread it to others without realising.

BBC: Spread of hepatitis C pinpointed

He says that oncologists need to spend much more time devising and analyzing equations that describe how fast tumors grow, how quickly cancer cells develop resistance to therapy and how often they spread to other organs.

FORBES: Magazine Article

Unlike normal patients, she did not develop antibodies to fight her infection, and it started to spread.

FORBES: A Pox On Your House? How Fighting One Disease Brought Back Another

This kind of cancer is relatively easy to treat, but these women are at increased risk to develop more serious forms ofbreast cancer that are likely to spread to other parts of the body and become lethal.

FORBES: Old Breast Cancer Drug Brings in New Money