It is impossible to estimate it in its entirety.
KLM said it is impossible to estimate the amount of its full-year loss.
Mr Dickerson, whose study is in its 10th year at the Phinda Game Reserve in KwaZulu-Natal, said it is impossible to estimate how many leopards remain in Africa.
She says it is impossible to estimate how much money they've spent to treat illnesses and extend their pets' lives.
"The backup is so extreme, it is impossible to estimate wait times," the Canadian Customs and Revenue Agency said in a bulletin posted on its Web site.
It is impossible to estimate such intangibles as the level of genuine enthusiasm among the Komsomols sent into the industrial plants or how long such enthusiasm lasted.
Without a central government in place in Kabul, officials of the International Committee for the Red Cross -- which has visited only a fraction of the prisoners -- say it is impossible to estimate the total number held in Afghanistan.
Photograph: Hugo Philpott/PA Born in Pennsylvania but more synonymous with his post-1978 playgrouNew YorkYork, it is impossible to estimate what Keith Haring's influence might have been had he lived beyond his mere 31 years.
The damage done to the houses is small: between 30 and 40 panes of glass were broken; but the damage inflicted upon the valuable specimen orchids in the houses it is impossible to estimate.
"It is like a Band-Aid to a gunshot wound to the heart," said Mr. Holcomb, who says it is impossible to estimate how many of the birds will survive when returned to the wild.
It is impossible to estimate how many instruments will be played over the course of the weekend, but it would be an interesting exercise to tot them up; bazookas and tablas, bongos and congas, udus, auds and nays, violins and flutes, guitars and sitars, accordions and keyboards.
