• WordNet 3.6
    • n half-life the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
    • ***


  • A. W. Hare
    A. W. Hare
    “Half the failures in life arise from pulling in one's horse as he is leaping.”
  • Mark Twain
    “The first half of life consists of the capacity to enjoy without the chance; the last half consists of the chance without the capacity.”
  • Napoleon Hill
    “It takes half your life before you discover life is a do-it-yourself project.”
  • John Irving
    John Irving
    “Half my life is an act of revision.”
  • Charles Haddon Spurgeon
    “Economy is half the battle of life. It is not so hard to earn money as to spend it well.”
  • Clarence Darrow
    “The first half of our life is ruined by our parents and the second half by our children.”


In literature:

Values her husband's life at half-a-crown!
"The Doctor's Dilemma" by George Bernard Shaw
I sometimes half think that the bread is so hard and the water so bitter, that life will become impossible.
"He Knew He Was Right" by Anthony Trollope
His own identity is half hidden from him by the practical wants of his life.
"The Golden Lion of Granpere" by Anthony Trollope
He hasn't seen much of women, living aboard ship half his life.
"Felix O'Day" by F. Hopkinson Smith
Nothing short of the prolonged sufferings of half a life could cleanse him.
"The Way We Live Now" by Anthony Trollope
There's a statue in terra-cotta, half as large as life, of the Dirty Boy.
"The Long Vacation" by Charlotte M. Yonge
Then, when silence had sunk deep and nothing happened for two and a half hours, it suddenly occurred to him that this was the end of his life.
"The Ball and The Cross" by G.K. Chesterton
That is about twenty-eight and one-half cents a life.
"Courts and Criminals" by Arthur Train
There followed for me one of the bitterest half hours I have had in my life.
"Richard Carvel, Complete" by Winston Churchill
Are you still and always as cold, as passive as you were then when you belonged half to life and half to death?
"The Emperor, Complete" by Georg Ebers
It's extraordinary how we go through life with eyes half shut, with dull ears, with dormant thoughts.
"Lord Jim" by Joseph Conrad
Half the vices in life he claims are unreal.
"The Evil Shepherd" by E. Phillips Oppenheim
I have lost touch with all that and become half wild and I like this life and the sunshine and being my own master.
"She and Allan" by H. Rider Haggard
She whom I have loved for half a life lies dying.
"Catharine Furze" by Mark Rutherford
Each flask was about half filled, and boiled for ten minutes, whereby all previously existing life was destroyed.
"Scientific American Supplement, No. 288" by Various
Two years passed, and at eighteen she was fretting that half her life had wasted away.
"The Christian A Story" by Hall Caine
Meantime, during the past half-hour, the law offices of Remington and Evans were not lacking in the sense of life and activity.
"The Sturdy Oak" by Samuel Merwin, et al.
The wilder spirits bore on, and when they had cut the remaining distance in half, the pit still showed no sign of life.
"Children of the Frost" by Jack London
There she stood behind an Indian gambler, to whom she had joined her life, painted and beaded and half intoxicated.
"My Native Land" by James Cox
She who recognised only the life of the body felt that one half of her was already dead.
"Phantom Fortune, A Novel" by M. E. Braddon

In poetry:

Yet in herself she dwelleth not,
Although no home were half so fair;
No simplest duty is forgot,
Life hath no dim and lowly spot
That doth not in her sunshine share.
"My Love" by James Russell Lowell
I well could praise thee for a flower, a dove,
But not for life that is not life in me;
Not for a being that is less than love—
A barren shoal half lifted from a sea!
"Shall The Dead Praise Thee?" by George MacDonald
Afar upon the purple hills of Spain--
Since waned the moons of half a year ago--
I sported, reckless as the laughing main,
Nor dreamed in life a thought of grief to know.
"Mystery Of Carmel" by Madge Morris Wagner
Afar upon the purple hills of Spain—
Since waned the moons of half a year ago—
I sported, reckless as the laughing main,
Nor dreamed in life a thought of grief to know.
"To The Holy Father Sanson" by Madge Morris Wagner
He would not stay for me, and who can wonder?
He would not stay for me to stand and gaze.
I shook his hand, and tore my heart in sunder,
And went with half my life about my ways.
"XII: He Would Not Stay With Me and Who Can Wonder" by A E Housman
For none the less, though song was but half true,
The world lay common, one abounding theme.
Man joyed and wept, and fate was ever new,
And love was sweet, life real, death no dream.
"Wordsworth's Grave" by William Watson

In news:

It has been years — almost two-and-a-half decades — since I've been able to participate in the March for Life in Washington, DC (although I've been able to take part in some local marches around the country).
Jessica Queller 's written her life into a half-dozen teen TV shows.
Tourette 's syndrome has plagued the 20-year-old singer for nearly half of her life.
The reason was that prozac has a half life of two weeks, it comes out of your system slowly.
The half-life of Thursday's debate between Joe Biden and Paul Ryan will be exactly four days -- until next week's rematch between President Obama and Mitt Romney.
A recent study from the Pew Forum on Religion and Life reveals that for the first time in our history, fewer than half of American adults say they are Protestant (48 percent).
Scott Shaw, The Plain Dealer Warren James, 56, of Cleveland spent more than half his life working in factories before a job loss propelled him to Cuyahoga Community College to retool.
Clearly, I spend a lot of my life on hold, as this short list represents only half the total I've recorded over the course of the last couple years.
Music has always been a big part of TJ Land's life, but he's only been gigging in the Anderson area for about a year and a half.
Sperm carry half the genes needed for human life.
Shingle returns to shoot second film there, 'Nairobi Half Life'.
For the good of the franchise, Ralph needs to step away, sell this toy that he has enjoyed for more than half of his life, and allow the team to move forward.
"Nairobi Half Life" considered for best foreign language film Oscar.
It's one thing to keep a car for half your life or longer.
BRECKENRIDGE — Shaun White now has been a pro snowboarder for half his life, developing himself as the most recognized action sports athlete of all time through 13 years of driven competition.

In science:

AGB stars (e.g. interpulse s-process versus thermal-pulse s-process, thermal-pulse duration and temperature versus 99Tc half-life).
The Henize sample of S stars. I. The technetium dichotomy
The 99Tc half-life is indeed much shorter than any stellar evolutionary timescale (but the TPAGB).
The Henize sample of S stars. I. The technetium dichotomy
The half-life of long-lived β decayers such 187Re,40 K,87 Rb has been determined either in laboratory measurements or by comparison with the age of meteorites, as found from α decay radioactivity analysis.
Testing theories that predict time variation of fundamental constants
Sisterna and Vucetich (1990) have derived a relation between the shift in the half-life of three long lived β decayers and a possible variation between the values of the fundamental constants α, ΛQCD and GF at the age of the meteorites and their value now (see entries 2,3 and 4 of Table 2).
Testing theories that predict time variation of fundamental constants
GENIUS test facility could improve existing half life limits by up to a factor of 8.
GENIUS-TF: a test facility for the GENIUS project
It would allow to reach a half life limit of about 1.6×1026 yr and thus to test the effective Ma jorana neutrino mass down to 0.1 eV with 90% C.L. after 6 years of measurement.
GENIUS-TF: a test facility for the GENIUS project
Three-laboratory measurement of the 44 ti half-life.
A selection of papers with some relevance to the investigation of the Sun-Climate link: Papers on Data, Methods and Commentary
On the half-life of 44Ti by results in meteorites.
A selection of papers with some relevance to the investigation of the Sun-Climate link: Papers on Data, Methods and Commentary
The dashed line in Figure 1 is the fit of a simple exponential decline in citations with a half-life of 4.93 years beginning two years after publication.
The Effectiveness of the Canada-France-Hawaii Telescope
Abt (1981) found a half-life of around twenty years for papers published in the 1961 issues of ApJ, ApJS and AJ.
The Effectiveness of the Canada-France-Hawaii Telescope
The half-life of the older papers is 7.11 years while the half-life for the newer papers is 2.77 years.
The Effectiveness of the Canada-France-Hawaii Telescope
The solid line is the data for all CFHT papers and the dashed line is the fit of a simple exponential decline with a half-life of 4.93 years.
The Effectiveness of the Canada-France-Hawaii Telescope
The technique for detection of the neutrino reaction involves the observation of the radioactive decay of 71Ge (half-life 11.4 days) by extraction and deposition into low-background proportional counters.
Astrophysical Neutrino Telescopes
Analysis of the counting rates includes fitting a component with the characteristic half-life of 71Ge as well as for background components including cosmogenically-produced 68Ge (half-life 271 days) and other long-lived backgrounds.
Astrophysical Neutrino Telescopes
Milestones during this R&D phase will include the determination of the 2ν − ββ half-life and the optical properties of liquid xenon, such as the scattering length of scintillation light.
Astrophysical Neutrino Telescopes