Top 100 presentations

1. Continuous Verb Tenses
   35456
2. Support and transport in plants
   33936
3. Anyong Tubig Anyong Lupa sa Asya
   29425
4. Elements compounds and mixtures
   26105
5. Chromosome
   22152
6. Simple Verb Tenses
   20838
7. Atomic Structure
   20349
8. Balancing Chemical Equations. Balancing redox equations
   20212
9. Periodic Behavior
   19961
10. Newton’s laws of motion
    18955
11. Periodic Trends
    16781
12. Adverbs
    16669
13. Percent Composition, Empirical and Molecular Formulas
    16022
14. Animal Farm
    15855
15. Bonding, Molecular Shape & Structure
    14804
16. Circulation and Gas Exchange
    13554
17. MakingFood
    13467
18. DNA - An overview
    13178
19. Atomic Structure and Periodic Trends
    12974
20. Fungi
    12930
21. Volumetric
    12731
22. Feminism- Cure or Curse
    12582
23. Atomic Structure and Periodicity
    12569
24. Hormones and the Endocrine System
    12265
25. Animal Development
    12198
26. Derivation Applications of Bernoulli Principal
    11950
27. Osmoregulation and Excretion
    11573
28. Plasma Membrane-Gateway to the Cell
    10843
29. Plant Structure, Growth, and Development
    10823
30. Acid, bases and salts
    10373
31. Development
    10284
32. Mirrors and Lenses
    10221
33. Structure of the Atom
    9971
34. Balanced forces
    9965
35. Ancient Civilizations
    9864
36. Mass Spectrometry
    9789
37. Pronouns
    9764
38. Nouns
    9724
39. Resource Acquisition and Transport in Vascular Plants
    9577
40. Forests
    9415
41. Support and transport in plants
    9415
42. Atomic Structure
    9345
43. Cell Types and Cell Structure
    9012
44. Newton’s third law of motion
    8989
45. Animal Nutrition
    8794
46. Transplantation Immunology
    8670
47. Cellular respiration
    8541
48. Sensory and Motor Mechanisms
    8434
49. Growing Plants
    8418
50. Plant Responses to Internal and External Signals
    8300
51. Electrical Circuits
    8289
52. Lab Equipment
    8077
53. Prepositions
    8011
54. Neurons, Synapses, and Signaling
    7969
55. Viruses, Viroids, and Prions
    7929
56. Of Mice and Men
    7872
57. A Tour of the Cell
    7819
58. Basic Structure of a Cell
    7692
59. Real time PCR and it's functions in diagnosis
    7664
60. Covalent Bonding (Molecules)
    7611
61. Plant structure adaptations and responses
    7569
62. Cellular Division
    7483
63. Ionic Bonding
    7475
64. Mendelian Genetics
    7135
65. To Kill a Mockingbird
    7116
66. Satellite Orbits and Uses NIS
    7077
67. Blood Type Genetics
    7061
68. Sound
    7029
69. Well logging The Bore Hole
    6942
70. Molecules and Ions
    6941
71. The Immune System
    6926
72. Membrane Structure and Function
    6849
73. Animal Reproduction
    6790
74. The Chemistry of Acids and Bases
    6763
75. Angiosperm Reproduction and Biotechnology
    6725
76. Plant Diversity
    6652
77. Mendel and the Gene Idea
    6648
78. Rocks
    6636
79. Cell Communication
    6622
80. Balancing Chemical Equations
    6528
81. Rate Laws
    6398
82. Introduction to Oscillations and Simple Harmonic Motion
    6370
83. Drama
    6359
84. Hybridization of Orbitals
    6343
85. The Building Blocks of Matter Atoms
    6292
86. Empirical Formula
    6230
87. An Introduction to Metabolism
    6223
88. Electron Quantum Numbers
    6203
89. Translation. Protein from RNA
    6106
90. Neurons
    6073
91. The Structure and Function of Large Biological Molecules
    6055
92. Photosynthesis
    5995
93. The Mole
    5927
94. Cell Membrane + Tissues & Organs Definitions
    5915
95. Earthquakes
    5863
96. Karyotypes
    5855
97. ADP, ATP and Cellular Respiration
    5823
98. Endocrine System
    5765
99. Classical greek philosophy
    5738
100. Population Ecology
     5715

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)