Origin: The oldest established Eucalyptus fossils are shockingly from South America. Surprisingly, eucalypts are not widespread here. The fossils are dating back to the early Eocene (51.9 Mya) and were found in the Laguna delHunco store in Chubut territory in Argentina. This demonstrates the class had a Gondwanan circulation. Fossil leaves likewise happen in the Miocene of New Zealand, where the variety isn't local today. 

The most established dependably dated macrofossil of Eucalyptus is a 21-million-year-old tree-stump encased in basalt in the upper Lachlan Valley in New South Wales. Different fossils have been found, however many are either questionably dated or else inconsistently identified. 
The present superdominance of Eucalyptus in Australia might be an antiquity of human impact on its environment. 
In spite of the fact that eucalypts must have been seen by early European adventurers and authorities, no records mention them until 1770. In 1770, when Joseph Banks and Daniel Solander touched base at Botany Bay with James Cook, where they gathered E. gummifera and later, close to the Endeavor River in northern Queensland, they gathered E. platyphylla. 

In 1777, on Cook's third endeavor, the botanist David Nelson gathered a eucalypt on Bruny Island, southern Tasmania. This example was taken to the British Museum in London, where it was named Eucalyptus obliqua by the French botanist, Charles-Louis L'Héritier, who was working in London at the time. He instituted the conventional name from the Greek roots eu and calyptos, signifying 'admirably' and 'secured', in reference to the operculum of the bloom bud. 
Among 1788 and the start of the nineteenth century a few additional types of Eucalyptus were named and distributed. A large portion of these was by the English botanist James Edward Smith and most were, as may be normal, trees of the Sydney locale. 

The nineteenth century was a time of the broad land investigation. This brought about the revelation of numerous new eucalypts and their consequent naming by a few of the extraordinary botanists in Australian history, especially Ferdinand von Mueller, whose take a shot at eucalypts contributed significantly to the main exhaustive record of the sort in George Bentham's Flora Australiensis (1867) - still the main complete Australian greenery. 

Scientifically: Eucalyptus has been found to have antibacterial properties from ancient times. Towards the finish of the nineteenth century, it was utilized in English emergency clinics to purify urinary catheters, and late research validates this case. In an investigation distributed in the Asian Pacific Journal of Tropical Biomedicine (APJTB), analysts found that basic oil extricated from Eucalyptus globulus leaves is especially powerful against normal strains of microscopic organisms, for example, E. coli and Staphylococcus aureus.
It promotes oral care, provides respiratory relief, helps in pain management, soothes a cough, improves seasonal allergies, etc. 
In one investigation, specialists connected eucalyptus balm on members and found that it had the capacity to help give transitory relief from discomfort, making it valuable for competitors after an amusement.

Moreover, the discoveries propose that it tends to be utilized as a detached type of warm-up because of its capacity to raise muscle temperature. 
In Tunisian society prescription, inward breath of Eucalyptus sp. basic oil has customarily been utilized to treat respiratory tract issue, for example, pharyngitis, bronchitis, and sinusitis 
Customarily, eucalyptus oil was utilized as a pain relieving operator that soothed agony, and it was esteemed for its capacity to lessen irritation and improve respiratory conditions. 
Eucalyptol has cancer prevention agent, mitigating and torment diminishing impacts. Eucalyptus is additionally notable for its capacity to battle bacterial, viral and contagious contaminations, and to help clear the respiratory tract of developed bodily fluid. 

Research demonstrates that Eucalyptus globulus, of which cineole is the real dynamic fixing, lessens the incendiary impact of constant bronchitis and represses the hypersecretion of aviation route mucins in creature thinks about. A randomized report distributed in Evidence-Based Complementary and Alternative Medicine assessed the treatment of upper respiratory tract contaminations utilizing fragrant herbs. The preliminary was led in six essential consideration centers in northern Israel and members were treated with a basic oil mix that included eucalyptus, peppermint, oregano, and rosemary fundamental oils. Those in the trial gather connected the fundamental oil mix as a splash five times each day for three days and contrasted these outcomes with a fake treatment shower. 

Usage: Since ancient times, Eucalyptus oil is used as Analgesic, Antibacterial, Anticatarrhal, Anti-Infectious, Anti-Inflammatory, Antiviral agent, Antispasmodic, Insecticidal and Expectorant

DIY Eucalyptus Tea: Ingredients - 1 cup of water, 1/2 tsp. of dried eucalyptus leaves per cup of water, and Raw, organic honey to taste 
Method: Pour boiling water over dried eucalyptus leaves. Let it brew for 10 minutes and add honey to taste.

Below are some DIY for great skin and hair with eucalyptus oil:

-    Take 50 ml of white vinegar and 5 ml of eucalyptus oil, mix them together in a liter of water. Use this concoction as a hair rinse. Keep it on for 10 minutes and then shampoo your hair. This prevents itchiness on the scalp.
-    Take 1 tablespoon of olive oil and add a teaspoon of eucalyptus oil to it. Mix them well and apply on the hair roots. This oil mixture helps in promoting hair growth.
-     Take a few drops of eucalyptus oil and apply on the irritated skin area. This helps in soothing the skin.
-    Just add a few drops of this essential oil to coconut or almond oil and apply on the skin with a gentle rubbing motion. This helps in relaxing muscles. 
-    Take a few drops of eucalyptus oil and a few drops of olive oil. Mix them and gently massage your face. This helps in improving skin texture.