Earth & Life Sciences

The tiger: a sad tale of declining numbers

International Tiger Day, also known as Global Tiger Day, is an annual celebration held annually on 29 July. The initiative of the Saint Petersburg Tiger Summit, the day raises awareness of tiger conservation, promotes opportunities for discussing the tiger’s natural habitats, and encourages support for ongoing conservation efforts. Ahead of International Tiger Day this Sunday, we take a look at the threats tigers face today with n this amended extract from The Encyclopedia of Mammals.

HIV and AIDS in Latinos

By Kurt C. Organista

30 years into the epidemic I remain struck by is how HIV continues to exploit our country’s entrenched social, cultural, and economic cleavages — almost to the point of appearing to be a homophobic, racist, sexist, and transphobic virus! Latinos now rank second to African Americans in their disproportionately high rates of AIDS cases: 50% & 20%, respectively, despite only composing 13% & 15% of the US population. Consider for example that 75% of AIDS cases in the US are among men who have sex with men (MSM), and the same is true within US Latino population.

The water problem

By William deBuys
The dirty little secret about water in the West is that water conservation is a hoax. When we conserve water by using less, we don’t save it for the health of the watershed or put it aside in any way; we simply make it available for someone else to consume, if not today, then tomorrow in the next strip mall or housing development down the road.

Snail attacks pencil

By Winfried S. Peters

On the Pacific coast of Costa Rica a major predator in the community of animals living on sandy beaches is a snail, a species of Olive Shell (Agaronia propatula). This snail moves up and down the beach by ‘surfing’, extending its foot so that it is carried along in the wave swash. It is a voracious hunter and its main prey is a smaller species of Olive Shell. In its wave-washed environment it has to act quickly.

Languages, Species, and Biological Parallels

By Stephen R. Anderson
Human languages are not biological organisms, despite the temptation to talk about them as “being born,” “dying,” “competing with one another,” and the like.  Nonetheless, the parallels between languages and biological species are rich and wonderful.  Sometimes, in fact, they are downright eerie…

Jan Zalasiewicz and Mark Williams talk four billion years of climate change

Climate change is a major topic of concern today, scientifically, socially, and politically. But the Earth’s climate has continuously altered over its 4.5 billion-year history. Geologists are becoming ever more ingenious at interrogating this baffling, puzzling, infuriating, tantalizing, and seemingly contradictory evidence. The story of the Earth’s climate is now being reconstructed in ever-greater detail — maybe even providing us with clues to the future of contemporary climate change. Below, you can listen to Dr Jan Zalasiewicz and Dr Mark Williams talk about the topics raised in their book The Goldilocks Planet: The four billion year story of Earths Climate.

The sex lives of mushrooms

The overnight appearance of mushrooms in a meadow or on a suburban lawn is a marvelous sight. It is one of many awe-inspiring, magical processes that have evolved among the fungi, yet this group remains the least studied and most poorly understood kingdom of organisms.In the video below, internationally renowned mushroom expert Nicholas Money talks us through the strange beauty – and strange sex lives – of mushrooms

Climate change, coral reefs, and social capital

By Tim McClanahan and Josh Cinner
Human relationships with nature can follow different paths. Sometimes the path leads to the collapse of both ecosystems and society. History shows that the directions down this path are simple; unsustainable practices lead to severe environmental damage. This damage has various harmful feedbacks into society, particularly through food production.

Diamonds

By William D. Nesse
2012 marks the Diamond Jubilee of the coronation of Queen Elizabeth II of England. The Imperial State Crown she wore after her coronation and the Soverign’s Sceptre with cross that she held contain two of the most remarkable gems in the world. Both were cut from the Cullinan diamond, reportedly the largest diamond ever found (3106 carats/0.62 kg). Cullinan I or Star of Africa (530.2 carats) is the largest of the nine gems cut from the Cullinan and it is now part of the Soverign’s Sceptre with cross. The Cullinan II, or Lesser Star of Africa (317.4 carats), is mounted on the Imperial State Crown.

The detrimental environmental impact of the media

By Richard Maxwell and Toby Miller
We’ve seen Earth Day pictures of our planet that highlight its symmetry, its chaos, and its beauty. We’ve learnt about the pollution and environmental decay that threaten us all. Media coverage of the environment over the last five decades has shown how natural beauty and human and animal health have been affected by mining and manufacturing, and the increasing danger of climate change. In this context, the media have generally been regarded as sources of information.

How do humans, ants, and other animals form societies?

Forming groups is a basic human drive.  Modern humans are all simultaneously members of many groups — there is the book club, your poker buddies, all those fellow sport team enthusiasts. Most basic of all these groups is the connection we form with our society. This is one group people have always been willing to die for. During most of human history, foreigners have been shunned or killed. Allowing an outsider to join a society is typically an arduous process, when it is permitted at all.

Decoding the beauty of pearls

By Nori Satoh
How beautiful pearls are. Pearls emit a complex pattern of brightness, each with completely different color combination. They have attracted human beings, especially women, for long time, but simultaneously they have attracted biologists with a long-standing question of how pearl oysters generate such beautiful biomineralized materials.

Time-travelling to distant climates

By Jan Zalasiewicz and Mark Williams
Imagine that time machine has finally been invented. All of the ancient Earth can now be visited. One could experience the world as it was: see long-dissipated cloud systems with one’s own eyes, feel ancient rain and primeval winds, and sense the warmth of prehistoric sunshine on one’s back. A safari into the ancient past with just 5 stops were allowed. Where would one choose to go?

The evolution of orchids

By Alec Pridgeon
“Blasphemy”! That was the only remark that anyone heard from the woman after she stormed out of the orchid society meeting in Florida. Taken aback for a moment, the speaker continued his talk on orchid evolution to an otherwise appreciative audience.

It’s Ecology, not Environmental Science

By David Gibson
“You’re an ecologist, so tell me, should I replace all the incandescent bulbs in my house with fluorescent bulbs? And, what about these new light-emitting diode (LED) bulbs?” Well, I have a reasonably well-informed opinion on this issue, but it’s not really my expertise. “Perhaps then you can tell me more about the problem of invasive species?” Now you’re talking; this is something that ecologists can help with.

DNA Day, 2023

By Harry Ostrer
Imagine this day in 2023. You decide it is time to allow your doctor to obtain your whole genome sequence to develop a risk profile. You are 58 years old and you have been forgetting simple things. Your family is worried. Your genetic counselor asks which results you would like to learn. You choose only the results for which your doctor says something useful could be done.