Seb Joannin

@sebjoannin.bsky.social

Family, Sciences and bike trips 翻山越岭 #paleoecology #paleoclimate #human impact #Eurasia Work at @cnrs.bsky.social @isemevol.bsky.social @umontpellier.bsky.social

5 jours de travail et des millions de données analysées. Je peux enfin répondre à deux questions : ➡️Comment qualifier la sécheresse de 2026 ? ➡️Et surtout, comment les sécheresses évoluent elles en France ? Je vous présente les résultats dans ce thread richement illustré. 1/10

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Papier récemment publié sur les blessures en trottinette électrique : en 2025 la trottinette électrique est passée spectaculairement devant vélo+moto à l'Hôpital Femme Mère Enfant de Lyon pour les traumas crâniens des enfants.

Electric-Scooters: An Emerging Source of High-Severity Pediatric Head
Trauma
Pierre Petitet, PhD 1,2,3, Alessandra Musarra, MD1, Camilla de Laurentis, MD1,2, Pierre-Aur ´elien Beuriat, MD, PhD1,2,
Alexandru Szathmari, MD, PhD1,2, Matthieu Vinchon, MD, PhD1,2, Sofia Guernouche, MSc1,2, Etienne Javouhey, MD, PhD2,4,
Federico Di Rocco, MD, PhD1,2
1Department of Pediatric Neurosurgery, H ˆopital Femme Mère Enfant, Hospices Civils de Lyon, Universit ´e de Lyon, Bron, France; 2Facult ´e de M ´edecine Lyon Est, Claude Bernard
University Lyon 1, Lyon, France; 3Centre de Recherche en Neurosciences de Lyon, Trajectoires Team, CNRS U5292, Inserm U1028, Universit ´e de Lyon, Bron, France; 4Pediatric
Intensive Care Unit, H ˆopital Femme Mère Enfant, Hospices Civils de Lyon, Universit ´e de Lyon, Bron, France
Correspondence: Pierre Petitet, PhD, H ˆopital Femme Mère Enfant, 59 Bd Pinel, Bron 69500, France. Email: pierre.petitet@chu-lyon.fr
Received, February 09, 2026; Accepted, May 20, 2026; Published Online, July 2, 2026.
Neurosurgery 00:1–10, 2026 https://doi.org/10.1227/neu.0000000000004153
Copyright © 2026 BACKGROUND AND OBJECTIVES:

Electric scooters (ES) have become increasingly popular among children and adolescents in France. To date, very little is known about their impact on the incidence and severity of pediatric head trauma (HT).
METHODS:

We conducted a retrospective single-center study of patients aged 2 to 18 years admitted to a pediatric neurosurgery ward between 2021 and 2025 for HT related to ES, nonmotorized two-wheeled vehicles (bicycles, kick-scooters; NMTV), or motorbikes. Demographics, accident characteristics, helmet use, clinical and radiological severity, neurosurgical management, hospital course, and need for rehabilitation were collected. Injury severity was assessed using a multivariate model combining neurological, radiological, and in-hospital outcomes. A follow-up phone interview was conducted in a subset of ES patients to assess long-term functional outcome and postinjury behavior regarding mobility habits.
RESULTS:

ES-related HT rose from 1 case in 2021 to 25 in 2025, whereas the number of HT related to NMTV and motorbikes remained stable. Nearly half of injured ES riders were below the legal age, and helmet use was rare. The severity profile of ES-related HT was greater than that of bicycle and kick-scooter accidents, and comparable to that of motorbike accidents. Five ES patients required surgical intervention, most commonly for epidural hematoma evacuation. At follow-up, most patients had favorable functional outcomes, but nearly one-third experienced persistent disability, and helmet adoption after injury remained limited.
CONCLUSION:

ES have emerged as a high-severity mechanism of pediatric HT, comparable to motorbikes. Enhanced prevention strategies, including helmet enforcement, and age regulation, are urgently needed.Type de véhicule 2021 2022 2023 2024 2025
Trottinette électrique 1 4 6 8 25 
Véhicule non motorisé (NMTV)18 17 15 16 15 
Moto 7 6 7 5 6
EmmanuelSPV@emmanuelspv.bsky.social · 3w ago

L'envolée des chiffres des blessés graves en France métropolitaine en EDPm (trottinettes électriques, gyroroues, etc). On en est déjà à l'équivalent de la moitié des blessés à vélo alors que l'usage en est encore loin.

Année	T1	T2	T3	T4	Total
2020	20	28	–	–	211
2021	63	111	–	–	413
2022	112	146	–	–	604
2023	124	182	–	–	671
2024	145	214	–	–	833
2025	209	321	–	–	1 154
2026	301	413	–	–	en cours

Tree rings are the best proxies for Holocene climate reconstruction! 🌲💍 This work shows that Northern Hemisphere Common Era natural variability was ca 4°C, extended to 5.5 °C during the 21st century! 🔥 What are considered "warm periods" (RWP, MCA) aren't really that hot compared to the 21st c.! 📈

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A #Montpellier, la #chaleur est inédite, insupportable. Du 29 juin au 8 juillet 2026, la température moyenne est de 29,8°C à l'aéroport, soit une anomalie de +6,3°C. Jamais une telle température moyenne, ni une telle anomalie, n'avaient été observées depuis l'ouverture en 1946. 1/3

ILS APPELLENT ÇA LE BEAU TEMPS On sera comme des harengs Grillés carbonisés Des crêpes mal famés Ils appellent ça le beau temps Ce potage bouillant Le soleil feu de joie Immolera vous et moi Ils appellent ça le beau temps Ils appellent ça le beau temps BRIGITTE FONTAINE ( #canicule épisode 3 )

une photo de Brigitte fontaine en veste jeans noir avec un éventail noir où il est écrit en lettres blanches FUCK OFF

The June 2026 heatwave will go down as the most statistically anomalous heat event ever observed at any time of year in metropolitan France. The 4-day mean temperature anomaly breached the extraordinary +10°C mark.

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Does El Niño forecasting have their own version of a "hot models" problem? There are currently 13 seasonal forecast ensembles used to predict future El Niño / La Niña. Diversity is good, but there remains broad disagreement among them, with some suggesting all-time records. 🧵

Plot segmented by month showing model forecasts for the Relative Oceanic Nino Index (rONI) during 2026 as well as historical record highs.

Accidentalité routière : quels sont les modes impliqués dans les collisions mortelles ? Chaque année, l’ONISR réalise un tableau ⬇️ qui croise les modes de transport impliqués dans les accidents mortels. A dérouler ⤵️

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Could the AMOC really collapse!? A brand new study shows what science has long surmised - decreased poleward heat transport in the Atlantic - a slow down of Earth’s most vital circulation the AMOC - is indeed the cause of the very odd cold blob (warming hole) in the N. Atlantic… 1/

The City of Ottawa posted the raw speed data from before and after Doug Ford banned speed cameras and the effect is so obvious it's not even necessary put a line marking when that happened. This chart shows the percentage of drivers going 15km/h or more over the posted limit.

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Un carrefour à la hollandaise ne fonctionne pour les cyclistes que si les conducteurs de véhicules motorisés jouent le jeu. Ici, un exemple au Nord de Lyon au niveau d'un accès autoroutier. Ne convient pas à des cyclistes débutants. 😓 #AssertivitéCyclable

📯 New fire study from Uzbekistan, carried out by Cheima Barhoumi and her co-authors. This study explores Holocene fire regimes through macro-charcoal analysis of sediment cores. Results reveal distinct fire phases driven by both climatic fluctuations and human activities doi.org/10.1016/j.an...

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Lake Fazilman provided the first sedimentary sequence covering the Holocene in Uzbekistan. In this fantastic publication by Dugerdil and co-authors, pollen and molecular biomarkers allow us a major advance in understanding the climate of West Central Asia. Paper is out here doi.org/10.1016/j.ca...

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