They believe millions of them are passing through us every second without a trace.
BBC: Dark Matter: Experiment to shed light on dark particles
"Tesco invests to help build brands where we believe we can add value, " says a spokesman.
So why do we persist with the male mid-life crisis, talk about it, believe in it?
Nonetheless, the gruesome commerce flourishes because many Chinese believe in the medicinal value of the creatures.
The researchers believe a person's immunological parameters could provide an indication of their true biological age.
There is absolutely no appetite, I believe, in the party to change the leader.
Sometimes it was hard to believe that we would ever get things moving again.
Scholars generally believe that he was born sometime around 373 AD in Roman Britain.
We believe that opening it up to same-sex couples will strengthen, not weaken, the institution.
Believe.in is part of a wider movement in the UK's tech community to change this.
Scientist: I must confess, I find it difficult to believe in a disease of machinery.
Is it desirable that the President of the United States should believe in God?
The companies believe these innovations will drive down maintenance costs and help to maximise energy production.
Others believe the urns were used as distilling vessels during the early stages of funeral rites.
That would be difficult but I believe we would be able to do it.
San Francisco officials believe it's important for everyone to have access to the Internet.
The Swedes believe the priorities are wrong: too much money is still going on agriculture.
"We believe we're not just preparing students for government measures, we're preparing students for life, " he says.
Mr. MUTLAQ: I believe that, you know, they cannot spend two days only talking about the election.
And I believe had McCain picked a more qualified running mate, he would've had a better chance.
Zoo managers say they did this to permit an investigation, but that is exceedingly hard to believe.
Some in the central government believe piracy hurts Chinese economic growth, and they want to fight it.
Change comes slowly in the charity sector, so the investors backing believe.in may need to be patient.
Does the president believe that head-slapping and simulated drowning are necessary tactics to use against suspected terrorist.
"I do believe there is a better way than the way we have chosen to go, " he says.
Mr Awan was from Abbottabad and some analysts believe that the attack may be linked to his death.
Holding this, I believe intensely in the importance of the family as the continuing unit of human life.
They're a dog-and-pony show to shore up, I believe, support from the very restrictionist corners of our society.
Many believe that their involvement with the life of the theatre was more than that of passive patronage.
"I really believe this is going to be life-changing for my son, " she says.
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