The Royal Swedish Academy of Sciences has decided to award the 2026 Nobel Prize in Physics to Francis Halzen “for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.”

Halzen realised that ice at the South Pole could be used to track particles known as neutrinos, according to the Nobel Prize website, which added that his vision and scientific leadership have been fundamental for the IceCube Neutrino Observatory – a cubic kilometre of ice that is equipped with light sensors.

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India has proposed a three-part Russia-Ukraine truce that would halt attacks on energy facilities and other infrastructure, keep grain and energy flowing through Black Sea ports, and end strikes on commercial shipping in the strategic waterway, people familiar with the proposal said.

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Nobel Prize in Physics 2026
1. Francis Halzen (Belgium-born physicist but U.S. citizen) won the 2026 Nobel Prize in Physics for pioneering work using South Pole ice to detect high-energy cosmic neutrinos.
2. He made decisive contributions to the IceCube Neutrino Observatory, located at the South Pole, Antarctica.
3. IceCube is a roughly cubic-kilometre neutrino detector embedded deep in Antarctic ice and equipped with light sensors.
4. It detects high-energy neutrinos of astrophysical origin coming from distant cosmic sources.
5. Neutrinos are electrically neutral, extremely weakly interacting subatomic particles, often called “ghost particles.”
6. Unlike light and many charged particles, neutrinos can travel vast cosmic distances with little deflection or absorption, making them valuable cosmic messengers.
7. Their detection has opened the field of neutrino astronomy / multi-messenger astronomy, helping study extreme astrophysical environments.

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UPSC had already asked about the IceCube Neutrino Observatory in 2015; it becomes even more important for Prelims after its link with the 2026 Nobel Prize in Physics.

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Bihar government has targeted 2030 to ensure that no poor person has to migrate outside Bihar for work.

Vidyarthi Saathi App —> Bihar government’s 24×7 digital learning platform providing live teacher support for students, including JEE–NEET preparation; students can log in via OTP and connect with a teacher within about one minute.

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Bihar Primary Education: Classes I–V will learn one regional dialect as an additional language; Maithili, Bhojpuri, Bajjika, Magahi and Angika are to be integrated into the foundational curriculum in line with NEP 2020.

Interlink: https://t.me/bpscweb/45852

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OPTogenetics - Nobel Prize 2026

1. What is Optogenetics?
Optogenetics = using LIGHT to switch specific genetically modified cells, especially neurons, ON or OFF.

Simple formula:
Gene + Light —> Control of nerve cell activity

2. Nobel Prize 2026
Nobel Prize in Physiology or Medicine 2026:
Karl Deisseroth + Peter Hegemann + Georg Nagel
—> for discoveries that established the science of Optogenetics.

3. Origin of the Discovery
• Key light-sensitive protein discovered from Chlamydomonas, a unicellular green alga.
• Important proteins: Channelrhodopsin-1 (ChR1) and Channelrhodopsin-2 (ChR2).
• Hegemann & Nagel identified/studied these light-sensitive ion channels.
• Deisseroth used them to control neurons in mammals, establishing modern optogenetics.

4. How does it work?
Light falls on Channelrhodopsin —> ion channel opens —> ions enter/leave cell —> electrical signal generated —> neuron becomes active.

In brain experiments, light is commonly delivered through an optical fibre.

5. Channelrhodopsin:- Must Remember
• Found in: Chlamydomonas
• Type: Light-gated ion channel
• Location: Cell membrane
• Function: converts light stimulus into electrical activity
• ChR2 is mainly activated by blue light.

6. Why is Optogenetics Special?
It can control only selected cells, unlike ordinary electrical stimulation which may affect many nearby cells.

Hence it provides:
High spatial precision + High temporal precision.

7. Medical/Research Applications
Being studied for:
Blindness/Retinitis pigmentosa, Parkinson’s disease, epilepsy, depression, anxiety, pain and brain-circuit mapping.

A major human application has been experimental restoration of vision in patients with retinitis pigmentosa.

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Varanasi–Ranchi–Kolkata Expressway (NH-319E): ~800 km, 6-lane corridor from Varanasi to Kolkata via Bihar & Jharkhand; Bihar’s 33.5-km Gaya stretch (Dumaria–Imamganj) is targeted to open by June 2027.

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Nobel Prize in Chemistry 2026: Awarded to Henri B. Kagan and Kenso Soai for discovering non-linear effects and autocatalysis in asymmetric organic synthesis, helping explain molecular homochirality.

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Case Study: Bihar’s Mukti Bazar (also called Mukti Outlets) markets prison-made goods, promoting inmates’ skills, income and rehabilitation.

Use in: Prison reforms, reformative justice, skill development, social justice.

Interlink: https://t.me/bpscweb/46349

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Bihar’s Bobby Kumar won bronze in Sepak Takraw at the Asian Games, Nagoya (Japan); India defeated Vietnam, Laos and Myanmar.

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Vaibhav Sooryavanshi (Bihar) became the youngest Indian to win an Asian Games gold medal, aged 15 years, 6 months & 6 days, as part of India’s men’s cricket team at the 2026 Aichi–Nagoya Asian Games (Japan).

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Fencing World Cup 2027: Rajgir, Bihar will host the FIE Fencing World Cup from 22–24 January 2027, becoming the first venue in Bihar to host an international-level fencing event; the tournament was earlier scheduled in Thailand but shifted to India.

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‘ Eco-Tourism Initiative (2026): Bihar will promote eco-tourism in natural/hilly areas through PPP mode:- priority sites are:-
- Odhni Dam–Banka
- Kharagpur Dam–Munger
- Jalkund Dam–Munger
- Tarakol Dam–Nawada
- Kasraiya Dhar(natural wetland)- Khagaria

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Bihar received 2 National Awards for better implementation of PMAY-U 2.0- Best Performing State and Special Recognition among Large States.

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