Rapid evolutionary change, or contemporary evolution, is not drastic humans are not likely to sprout wings a few generations down the road. Rather, these evolutionary effects are difficult to detect, as they are reflected in a population s genetic composition.

Something difficult to explain.

Hydrogen, oxygen, carbon and sulfur have been detected in the planet's inflated atmosphere.

Later it was rediscovered by Stephen Lacey and Richard Box in 1991.

I find it difficult to believe.

Both are deeply encrypted and difficult to detect once inside a computer.

This book is hard for me to read.

This reality is difficult to convey.

Global problems are hard to solve.

Interviewer It's actually quite difficult to walk.

In high altitudes, people find it hard to breathe.

I'm finding it difficult deciding on which one to buy.

But these interests are hard to quantify.

But there is a difficult legacy to overcome.

This book is too difficult for me to understand.

Sometimes reality and fantasy are hard to distinguish.

Are we Arabs racist? It's really hard to tell.

alternative remittance systems are difficult to licence or to supervise.

Outside this city, in addition to remains of large public buildings, a complex of small settlements has been discovered.

The transnational nature of those crimes hampers their detection and makes investigation and prosecution more difficult.

Mr. Schölvinck (Director, Division for Social Policy and Development) replied that natural disasters were difficult to predict and it was therefore difficult to develop mechanisms to prevent them.

But it's hard sometimes to talk about these things, so bear with me.

I find it difficult to express my meaning in words.

That is far harder to judge.

But, in doing so, it created a reality that is difficult to reverse.

I think today we were a witness to such a moment where unquantifiable victories are won.

If these technologies had been patented, Myriad might not have made its discoveries.

For Iraq, this is a brain drain that will be hard to repair.

So intellectual capture is a charge hard to refute. But were regulators surrogate lobbyists for the financial industry?

Online security is a complex issue that is sometimes hard to understand or to know how to face.

I was sleeping in a tent with 200 other people in it.

It s hard to get used, even for a few minutes, to the continuous sound of artillery bombing.

We've discovered things like, for example, RNA interference only a few years ago, and this is a really fundamental component of how cells work.

After Aristotle's death, much of the knowledge he had gained about cetaceans was lost, only to be re discovered during the Renaissance.

The effectiveness of this consultation mechanism is difficult to evaluate.

While many crimes seem to be targeted at foreigners, the criminals are not as easy to identify.

It's kind of hard to me not to make comparisons...

Joining words to each other is another option to mislead these programs.

Hence, a complex situation that is difficult to categorize by using general formulations.

The application of the above criterion to a given case may prove difficult.

It was the first land to have been spotted south of the Antarctic Circle, and was thus also the southernmost sighted land at the time of its discovery.

In 1997, India discontinued the production of non detectable anti personnel mines and has observed a moratorium on their transfer.

In fact, the evidence for a crisis of trust is rather difficult to interpret.

Once you start smoking, it is difficult to get rid of that bad habit.

The Middle East is a place where the dust hardly ever settles.